Fair Value of Financial Instruments - Level 3 (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended				3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2011 Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2012 Fair Value, Inputs, Level 3 [Member] Change in estimate	Sep. 30, 2012 Fair Value, Inputs, Level 3 [Member] Change in estimate	Sep. 30, 2012 Fair Value, Inputs, Level 3 [Member] Accretion [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2012 Short-Term Portion of Contingent Consideration [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2012 Long-Term Portion of Contingent Consideration [Member] Fair Value, Inputs, Level 3 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Goodwill, Impairment Loss	$ 29,748	$ 0	$ 29,748	$ 0
Obligations, Fair Value Disclosure										2,449	7,594	(800)	(1,600)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at December 31, 2011					2,449	7,594
Fair value level 3 activity							4,300	(5,910)	765
Balance at June 30, 2012					$ 2,449	$ 7,594