Common Stock-Schedule of Earnings per Share, Basic (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Class A Common Stock | |||
| Numerator: | |||
| Allocation of undistributed (loss) earnings | $ (32,651) | $ 10,408 | $ 23,063 |
| Dividends paid | 8,573 | 7,273 | 5,384 |
| Net (loss) income available to common shareholders, basic | $ (24,078) | $ 17,681 | $ 28,447 |
| Denominator: | |||
| Weighted-average common shares outstanding, basic (in shares) | 30,596 | 30,237 | 29,853 |
| (Loss) Earnings Per Share - Basic (usd per share) | $ (0.79) | $ 0.58 | $ 0.95 |
| Class B Common Stock | |||
| Numerator: | |||
| Allocation of undistributed (loss) earnings | $ (26,348) | $ 8,499 | $ 19,075 |
| Dividends paid | 4,938 | 4,444 | 3,456 |
| Net (loss) income available to common shareholders, basic | $ (21,410) | $ 12,943 | $ 22,531 |
| Denominator: | |||
| Weighted-average common shares outstanding, basic (in shares) | 24,690 | 24,690 | 24,690 |
| (Loss) Earnings Per Share - Basic (usd per share) | $ (0.87) | $ 0.52 | $ 0.91 |