CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Additional Paid-In Capital	Accumulated Deficit	Treasury Stock [Member]	Accumulated Other Comprehensive Loss	Non-controlling Interest	Common Class A [Member]	Common Class A [Member] Common Stock [Member]
Net (income) loss attributable to non-controlling interests	$ (6)
Balance (in shares) at Dec. 31, 2014								57,743,981
Beginning balance at Dec. 31, 2014	533,335	$ 679,275	$ (162,881)		$ (482)	$ 16,845		$ 578
Increase (Decrease) in Shareholders' Equity
Net (loss) income	44,401		44,407			(6)
Comprehensive loss	(406)				(406)
Dividends	(10,410)	(10,410)
Issuance and amortization of stock compensation (in shares)								53,550
Issuance and amortization of stock compensation	(865)	(865)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period								34,248
Stock Issued During Period, Value, Stock Options Exercised	553	553
Noncontrolling Interest, Increase from Business Combination	45					45
Stock Issued During Period, Shares, Employee Stock Purchase Plans								1,437
Ending balance (in shares) at Mar. 31, 2015								57,833,216
Ending balance at Mar. 31, 2015	568,383	670,283	(118,474)		(888)	16,884		$ 578
Treasury Stock, Value	3,509
Net (income) loss attributable to non-controlling interests	135
Balance (in shares) at Dec. 31, 2015							58,097,933	57,797,475
Beginning balance at Dec. 31, 2015	534,504	643,828	(121,182)	$ (3,509)	(65)	14,851		$ 581
Increase (Decrease) in Shareholders' Equity
Net (loss) income	(9,947)					135
Comprehensive loss	(4,192)				(4,192)
Issuance and amortization of stock compensation (in shares)								169,910
Issuance and amortization of stock compensation	(822)	(822)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period								18,567
Stock Issued During Period, Value, Stock Options Exercised	303	303
Payment of distribution	$ (502)					(502)
Stock Issued During Period, Shares, Employee Stock Purchase Plans								1,096
Treasury Stock, Shares, Acquired	(105,000)							(105,000)
Treasury Stock, Value, Acquired, Cost Method	$ 1,564			$ 1,564
Preferred Distributions	(1,750)	(1,750)
Ending balance (in shares) at Mar. 31, 2016							58,287,506	57,882,048
Ending balance at Mar. 31, 2016	517,674	$ 643,203	$ (131,264)		$ (4,257)	$ 14,484		$ 581
Treasury Stock, Value	$ 5,073