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Treasury Stock (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Equity [Abstract]      
Shares available for repurchase (in shares) 370,565    
Shares repurchased (in shares) 198,000 1,817,000 384,000
Cost of shares repurchased $ 12,647 $ 89,395 $ 16,168
Treasury stock reissued (in shares)     15,000