Fair Value Of Assets And Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Discount Rate	3.00%
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	$ 426,341
Long-term debt, net of current maturities	272,136	$ 459,105
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	17,400
Fair Value Inputs, Sensitivity Analysis, Hypothetical Discount Rate	3,800
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents and restricted cash	30,259	27,464
Deferred Payment-Founder, Fair Value	0	0
Contingent consideration liability	0	0
Business Combination, Contingent Consideration, Liability	0	0
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Fair Value	308,300	299,300
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Payment-Founder, Change in Fair Value	4,000
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	13,410
Cash equivalents and restricted cash	0	0
Deferred Payment-Founder, Fair Value	82,800	78,800
Contingent consideration liability	2,331	2,331
Business Combination, Contingent Consideration, Liability	341,210	$ 327,800
Unsecured Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, net of current maturities	$ 300,000