QUARTERLY FINANCIAL DATA: (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended										12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012		Mar. 31, 2012	Dec. 31, 2011		Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Net revenue	$ 105,885	$ 109,894	$ 105,830	[1]	$ 102,964	$ 98,044	[2]	$ 104,352	$ 96,944	$ 64,899	$ 424,573		$ 364,239	$ 279,292
Operating income (loss)	14,673	21,573	21,467	[1]	13,802	(8,842)	[2]	13,152	15,767	5,549	71,515		25,626	15,186
Net (loss) income from continuing operations	(15,024)	(10,230)	46,445	[1]	(75,170)	(16,818)	[2]	(7,374)	101,289	(64,034)	(53,979)		13,063	(26,349)
(Loss) income from discontinued operations	(117)	(25)	20	[1]	(15)	(109)	[2]	(21)	(22)	(8)	(137)		(160)	(276)
Consolidated net (loss) income attributable to common stockholders	$ (17,227)	$ (13,064)	$ 42,668	[1]	$ (79,242)	$ (21,538)	[2]	$ (9,878)	$ 98,550	$ (64,245)	$ (66,865)		$ 2,889	$ (28,633)
BASIC NET (LOSS) INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS
Net (loss) income from continuing operations per share (in dollars per share)	$ (0.34)	$ (0.26)	$ 0.85	[1]	$ (1.58)	$ (0.43)	[2]	$ (0.2)	$ 1.94	$ (1.23)	$ (1.33)		$ 0.06	$ (0.55)
Net (loss) income from discontinued operations per share (in dollars per share)	$ 0	$ 0.00	$ 0.00	[1]	$ 0.00	$ 0.00	[2]	$ 0.00	$ 0.00	$ 0.00	$ 0.00		$ 0.00	$ (0.01)
Consolidated net (loss) income per share attributable to common stockholders (in dollars per share)	$ (0.34)	$ (0.26)	$ 0.85	[1]	$ (1.58)	$ (0.43)	[2]	$ (0.2)	$ 1.94	$ (1.23)	$ (1.34)	[3]	$ 0.06	$ (0.56)
DILUTED NET (LOSS) INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS
Net (loss) income from continuing operations per share (in dollars per share)	$ (0.34)	$ (0.26)	$ 0.85	[1]	$ (1.58)	$ (0.43)	[2]	$ (0.2)	$ 1.86	$ (1.23)	$ (1.33)		$ 0.06	$ (0.55)
Net (loss) income from discontinued operations per share (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	[1]	$ 0.00	$ 0.00	[2]	$ 0.00	$ 0.00	$ 0.00	$ 0.00		$ 0.00	$ (0.01)
Consolidated net (loss) income per share attributable to common stockholders (in dollars per share)	$ (0.34)	$ (0.26)	$ 0.85	[1]	$ (1.58)	$ (0.43)	[2]	$ (0.2)	$ 1.86	$ (1.23)	$ (1.34)	[3]	$ 0.06	$ (0.56)
WEIGHTED AVERAGE SHARES OUTSTANDING
Weighted average shares outstanding - basic (in shares)	50,042,751	50,019,048	50,006,008	[1]	49,994,974	49,782,016	[2]	50,270,550	50,831,560	52,117,552	50,015,252		50,739,447	51,509,239
Weighted average shares outstanding - diluted (in shares)	50,042,751	50,019,048	50,124,418	[1]	49,994,974	49,782,016	[2]	50,270,550	52,905,060	52,117,552	50,015,252		52,294,322	51,509,239

[1] The net income from continuing operations for the quarter ended June 30, 2012 includes $313,000 of pre-tax impairment charges.

[2] The net loss from continuing operations for the quarter ended December 31, 2011 includes approximately $22.3 million of pre-tax impairment charges.

[3] Per share amounts do not add due to rounding.