Fair Value (Change in Carrying Value Associated with Contingent Payment Arrangements Level 3 Instruments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Fair Value, Liabilities Measurement Level 3 reconciliation
Balance as of beginning of period	$ 42,032	$ 46,924	$ 42,436	$ 38,205
Addition	0	450	0	9,365
Accretion	443	476	1,328	1,117
Payments	(3,658)	(948)	(4,947)	(1,785)
Balance as of end of period	$ 38,817	$ 46,902	$ 38,817	$ 46,902