Fair Value Measurements (Recurring Basis) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Unamortized Debt Issuance Expense	$ 19,915		$ 19,915			$ 3,300
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	20,612	$ 3,000	20,612	$ 3,000	$ 3,000	3,000	$ 3,000	$ 3,667
Contingent consideration maximum	41,000		41,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Acquisitions	(17,100)	0	17,100	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Payments	0	0	0	(691)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	512	0	512	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)	0	$ 0	0	$ 24
Significant Unobservable Inputs (Level 3) | Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Contingent consideration to be paid in cash for the acquisitions	$ 20,600		$ 20,600			$ 3,000