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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Apr. 26, 2016
Stockholders Equity [Line Items]        
Dividends declared, per share   $ 0.50    
Common stock dividends declared, quarterly   $ 0.125    
Payments of Dividends $ 0 $ 25,434 $ 25,039  
Beneficial Ownership Percentage Limit 4.90%      
2013 Stock Plan [Member]        
Stockholders Equity [Line Items]        
Number of shares available for grant       625,390