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Significant Accounting Policies (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Class of Stock [Line Items]      
Stock Repurchased and Retired During Period, Shares 600    
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 199,900    
Stock Repurchased and Retired During Period, Value 50    
Debt and Capital Lease Obligations 95,000   $ 105,000
Long-term Debt, Fair Value $ 98,200   $ 108,300
Dividends declared per share $ 0.10 $ 0.00  
2014 Share Repurchase Program [Member]      
Class of Stock [Line Items]      
Stock Repurchase Program, Authorized Amount $ 200,000    
2016 Share Repurchase Program [Member]      
Class of Stock [Line Items]      
Stock Repurchase Program, Authorized Amount $ 250,000