Income Taxes (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current deferred income tax assets:
Accounts receivable	$ 6,085	$ 5,362
State taxes	2,471	4,469
Other liabilities and reserves	9,716	8,112
Other assets	7,119	7,046
Inventory	1,275	1,321
Deferred Tax Assets, Valuation Allowance, Current	(4,087)
Deferred Tax Assets, Net of Valuation Allowance, Current	22,579	26,310
Deferred Tax Assets, Valuation Allowance		0
Total current deferred income tax assets	22,579	26,310
Non-current deferred income tax (liabilities) assets:
Net operating loss carryforwards	29,805	29,362
Write-down of assets	1,222	1,222
Start-up costs	335	335
Other assets	24,955	31,306
Intangible assets	(107,112)	(128,947)
Property and equipment	(22,649)	(27,131)
Unrealized loss on investments	0	1,961
Share-based compensation	7,377	6,416
Valuation allowance	(9,779)	(15,753)
Total non-current deferred income tax liabilities, net	$ (75,846)	$ (101,229)