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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Intangibles - Accumulated Amortization $ 4,640 $ 4,640
Preferred stock, par value (in USD per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 10,000,000 10,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, Class A    
Common stock, par value (in USD per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 150,000,000 150,000,000
Common stock, shares issued (in shares) 34,454,130 34,267,510
Common stock, shares outstanding (in shares) 33,202,209 33,135,650
Common stock, Class B    
Common stock, par value (in USD per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 30,000,000 30,000,000
Common stock, shares issued (in shares) 4,817,394 4,817,394
Common stock, shares outstanding (in shares) 4,817,394 4,817,394
5 3/4% Senior Notes due April 15, 2019    
Stated interest rate 5.75% 5.75%
7% Senior Notes due August 15, 2022    
Stated interest rate 7.00% 7.00%
5 7/8% Senior Notes due January 31, 2025    
Stated interest rate 5.875%