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Shareholders' Equity (Details) (USD $)
|
3 Months Ended | 9 Months Ended | 3 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Sep. 30, 2014
|
Sep. 30, 2013
|
Sep. 30, 2014
|
Sep. 30, 2013
|
Feb. 07, 2014
|
Sep. 30, 2014
Common Stock [Member]
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Jun. 30, 2014
Common Stock [Member]
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Mar. 31, 2014
Common Stock [Member]
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Dec. 31, 2013
Common Stock [Member]
|
Sep. 30, 2013
Common Stock [Member]
|
Jun. 30, 2013
Common Stock [Member]
|
Mar. 31, 2013
Common Stock [Member]
|
|
| Shareholders' Equity [Line Items] | ||||||||||||
| Dividends per share (in dollars per share) | $ 0.12 | $ 0.10 | $ 0.36 | $ 0.30 | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.10 | $ 0.10 | $ 0.10 | $ 0.10 | |
| Stock Repurchase Program, Number of Shares Authorized to be Repurchased | 2,000,000 | |||||||||||
| Stock Repurchase Program Number Of Shares Repurchased | 434,993 | 881,979 | ||||||||||
| Stock Repurchased and Retired During Period, Value | $ 19,987,000 | $ 39,972,000 | $ 0 | |||||||||
| Stock repurchased, common stock acquired, average cost per share | $ 45.95 | $ 45.32 | ||||||||||
| Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 1,118,021 | 1,118,021 | ||||||||||