Income Taxes (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Deferred tax assets
Net operating losses	$ 16,045	$ 27,581
Accruals not currently deductible	13,185	12,343
Bad debts	716	2,044
Alternative minimum tax credit	0	5,606
Foreign tax credits	2,026	2,150
Other	4,331	4,043
Total deferred tax assets	36,337	53,767
Valuation allowance	(16,734)	(20,459)
Total deferred tax assets, net of allowances	19,603	33,308
Deferred tax liabilities
Accelerated depreciation and amortization	47,320	32,182
Other	5,922	5,212
Total deferred tax liabilities	53,242	37,394
Total net deferred tax liabilities	(33,639)	(4,086)
Current portion of deferred tax assets	13,224	27,654
Non current portion of deferred tax assets	341	3
Current portion of deferred tax liabilities	(360)	(194)
Non current portion of deferred tax liabilities	(46,844)	(31,549)
Net deferred tax liabilities	$ (33,639)	$ (4,086)