Fair Value (Change in Carrying Value Associated with Contingent Payment Arrangements Level 3 Instruments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Fair Value, Liabilities Measurement Level 3 reconciliation
Balance as of beginning of period	$ 42,223	$ 37,688	$ 42,436	$ 38,205
Addition	0	8,915	0	8,915
Accretion	442	321	885	642
Payments	(633)	0	(1,289)	(838)
Balance as of end of period	$ 42,032	$ 46,924	$ 42,032	$ 46,924