Fair Value Of Assets And Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Discount Rate	2.80%
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	$ 423,531
Long-term debt, net of current maturities	299,992	$ 459,105
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	14,600
Fair Value Inputs, Sensitivity Analysis, Hypothetical Discount Rate	4,800
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents and restricted cash	28,254	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	307,900	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	3,500
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	11,100
Cash equivalents and restricted cash	0	0
Deferred Payment-Founder, Fair Value	82,300	78,800
Contingent consideration liability	2,331	2,331
Business Combination, Contingent Consideration, Liability	338,900	$ 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