Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details)

v3.8.0.1
Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income taxes [Line Items]        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 35.00%    
Current: [Abstract]        
Federal   $ 28,556 $ 24,139 $ 8,319
State   4,043 3,052 1,242
Current Income Tax Expense (Benefit)   32,599 27,191 9,561
Deferred: [Abstract]        
Federal   (12,011) 3,256 12,477
State   (457) 269 2,054
Deferred Income Tax Expense (Benefit)   (12,468) 3,525 14,531
Income tax expense (benefit)   20,131 30,716 24,092
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation     1,732 5,413
Income tax provision [Abstract]        
Tax expense at the statutory rate   37,608 20,435 27,883
State income taxes, net of federal benefit   2,339 2,229 2,178
Non-deductible transaction costs       394
Share based compensation   (366)    
Incentive stock options   32 (88) (120)
Other permanent differences   252 474 216
Deferred tax asset valuation allowance   78 (2) (11)
Federal qualified property deductions   (2,075) (1,311) (6,066)
Federal income tax credits   (58)   (732)
Non-taxable acquisitions   (568)    
Rate impact of deferred tax liabilities   (15,901)    
Other   (1,210) (11) 350
Income tax expense (benefit)   20,131 30,716 24,092
Deferred Tax Liabilities and Assets [Abstract]        
Accrued expenses   7,905 9,647  
Allowance for doubtful accounts   777 662  
Share-based compensation   3,002 5,005  
Accruals for income tax contingencies   251 252  
Net operating loss carryforwards   4,733 10,231  
Total deferred tax assets   16,668 25,797  
Valuation allowance   (360) (282)  
Total deferred tax assets, net of valuation allowance   16,308 25,515  
Tax over book depreciation   19,402 29,416  
Intangible assets   11,108 17,588  
Prepaid expenses deductible when paid   3,460 4,862  
Goodwill   11,741 15,520  
Deferred Tax Liabilities, Gross   45,711 67,386  
Net deferred tax liabilities   (29,403) (41,871)  
Federal net operating loss   18,586 27,050 36,034
Operating Loss Carryforwards, State and Local   18,126 18,155  
Balance sheet classification of deferred income taxes [Abstract]        
Deferred tax liabilites, noncurrent   (29,403) (41,871)  
Income taxes paid   36,110 10,628 25,264
Increase (Decrease) in valuation allowance for state loss carryforwards   78 (2)  
Reconciliation of Unrecognized Tax Benefits [Roll Forward]        
Balance at beginning of year $ 1,334 582 773 771
Additions for tax positions of current year   366 56 66
Additions for tax positions of prior years   400    
Reductions for settlement with state taxing authorities   (14) (247) (64)
Balance at end of year   1,334 582 $ 773
Income tax penalties accrued   105 103  
Interest on income taxes accrued   $ 201 184  
TQI [Member]        
Income tax provision [Abstract]        
Goodwill, Impairment Loss     $ 8,990