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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Fair Value, Liabilities Measurement Level 3 reconciliation
Balance as of beginning of period	$ 31,119	$ 42,223	$ 31,399	$ 42,436
Accretion	353	442	706	885
Payments	(611)	(633)	(1,244)	(1,289)
Balance as of end of period	$ 30,861	$ 42,032	$ 30,861	$ 42,032