Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 segment	Sep. 30, 2011	Dec. 31, 2011
Segment Reporting
Number of operating segments			4
Segment Reporting information
Total revenues	$ 119,617	$ 149,419	$ 382,902	$ 442,114
Income (loss) before income tax (benefit) expense	181	17,190	(261,885)	(200,270)
Identifiable assets	2,384,596	2,717,326	2,384,596	2,717,326	2,178,069
Acquisition related costs				2,523
Impairment charge on goodwill included in loss before income tax expense			274,285	225,035
Restructuring charges included in loss before income tax expense				17,678
U.S. Operations
Segment Reporting information
Total revenues	77,801	97,999	244,305	292,402
Income (loss) before income tax (benefit) expense	841	11,471	(239,715)	(211,231)
Identifiable assets	1,101,085	1,229,009	1,101,085	1,229,009
Impairment charge on goodwill included in loss before income tax expense	245,100		245,103
Restructuring charges included in loss before income tax expense		15,400		15,400
Canadian Operations
Segment Reporting information
Total revenues	17,727	21,682	58,877	64,350
Income (loss) before income tax (benefit) expense	1,637	5,623	9,020	15,267
Identifiable assets	98,082	131,311	98,082	131,311
Restructuring charges included in loss before income tax expense		700		700
European Operations
Segment Reporting information
Total revenues	14,793	18,611	50,412	54,487
Income (loss) before income tax (benefit) expense	(286)	1,335	(25,524)	935
Identifiable assets	567,527	660,219	567,527	660,219
Impairment charge on goodwill included in loss before income tax expense	28,500		28,481
Restructuring charges included in loss before income tax expense		1,200		1,200
Asia Pacific Operations
Segment Reporting information
Total revenues	9,296	11,127	29,308	30,875
Income (loss) before income tax (benefit) expense	(2,011)	(1,239)	(5,666)	(5,241)
Identifiable assets	617,902	696,787	617,902	696,787
Impairment charge on goodwill included in loss before income tax expense	700		701
Restructuring charges included in loss before income tax expense		$ 300		$ 300