Revenue Recognition (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	$ (4,236,359)		$ (4,049,965)
Right to recover product	222,697		203,589
Other current liabilities	$ 1,015,762		$ 1,034,441
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings		$ 8,000
Other current liabilities		$ 8,000