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Stockholders' Equity Stockholders’ Equity Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Class of Stock [Line Items]                  
Treasury Stock, Value, Acquired, Cost Method             $ 42,532    
Common Stock - Class A                  
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]                  
Common stock, shares issued 34,947,239           34,947,239   34,899,833
Common stock, shares outstanding 34,947,239           34,947,239   34,899,833
Warrants and Rights Note Disclosure [Abstract]                  
Warrants and Rights Outstanding 652,500           652,500    
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 11.33           $ 11.33    
Dividends, Common Stock [Abstract]                  
Dividends declared per share 0.025 $ 0.025 $ 0.025 $ 0.025 $ 0.025 $ 0.025 $ 0.075 $ 0.075  
Dividends paid per share $ 0.025 $ 0.025   $ 0.025 $ 0.025        
Common Stock - Class B                  
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]                  
Common stock, shares issued 8,049,029           8,049,029   8,049,029
Common stock, shares outstanding 8,049,029           8,049,029   8,049,029
Treasury Stock | Common Stock - Class A                  
Class of Stock [Line Items]                  
Treasury Stock, Shares, Acquired             6,596,000    
Treasury Stock, Value, Acquired, Cost Method             $ 42,524    
Treasury Stock | Common Stock - Class B                  
Class of Stock [Line Items]                  
Treasury Stock, Shares, Acquired             8,049,029    
Treasury Stock, Value, Acquired, Cost Method             $ 8