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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 |  |

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