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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 2 Months Ended 12 Months Ended 26 Months Ended
Jan. 04, 2015
Dec. 31, 2016
Nov. 30, 2016
Feb. 17, 2017
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Subsequent Event [Line Items]                  
Total Number of Shares Purchased 82,100 103,658 179,685   680,813 283,343 82,100 680,813 1,046,256
Average Price Paid Per Share $ 34.57 $ 50.00 $ 49.11   $ 35.22       $ 39.06
Repurchase of common stock           $ (14,018) $ (2,841) $ (24,002)  
Maximum Dollar Value of Shared That May Yet Be Purchased Under the Program   $ 59,000       $ 59,000     $ 59,000
Subsequent Event [Member]                  
Subsequent Event [Line Items]                  
Dividend authorized       $ 0.44          
Total Number of Shares Purchased       633,600          
Average Price Paid Per Share       $ 49.67          
Repurchase of common stock       $ 31,500          
Maximum Dollar Value of Shared That May Yet Be Purchased Under the Program       $ 27,500