CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
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)	28,964,219	28,363,879
Common stock, shares outstanding (in shares)	27,856,010	27,657,435
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)	3,813,884	3,813,884
Common stock, shares outstanding (in shares)	3,813,884	3,813,884
5 3/4% Senior Notes due April 15, 2019
Stated interest rate	5.75%	5.75%
8 1/2% Senior Notes due November 15, 2020
Stated interest rate	8.50%	8.50%
7% Senior Notes due August 15, 2022
Stated interest rate	7.00%	7.00%