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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 11 Months Ended 12 Months Ended
Dec. 16, 2015
Nov. 27, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2009
Common Stock Repurchase              
Repurchase of common stock authorized by Board of Directors           $ 100,000 $ 100,000
Number of years for repurchase of common stock           5 years  
Common stock repurchased, value     $ 16,500 $ 5,352 $ 5,918    
Common Stock              
Common Stock Repurchase              
Common stock repurchased (in shares)     912,000 249,000 395,000    
Common stock repurchased, value     $ 9 $ 2 $ 4    
Dutch Auction [Member]              
Common Stock Repurchase              
Common stock repurchased (in shares)     643,821        
Common stock repurchased, value $ 11,600   $ 16,500        
Weighted average price per share (in dollars per share)     $ 17.75        
Share Price $ 18.00            
Dutch Auction [Member] | Minimum              
Common Stock Repurchase              
Weighted average price per share (in dollars per share)   $ 15.50          
Dutch Auction [Member] | Maximum              
Common Stock Repurchase              
Weighted average price per share (in dollars per share)   $ 18.00