Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands, shares in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Oct. 24, 2014
Summary Of Significant Accounting Policies [Line Items]
Noncurrent restricted cash	$ 3,300	$ 4,300
Past due gross accounts receivable	5,100
Provision for Inventory obsolescence	32,072	8,827	$ 10,500
Allowance for inventory obsolescence	33,532	21,537	21,368
Research and development reserve	2,400	2,300
Depreciation	$ 22,200	$ 19,900	$ 14,200
Shares excluded from the computation of diluted net earnings per share (in shares)	3.6	0.9	0.7
Available-for-sale securities	$ 1,106	$ 5,941
Nicox [Member]
Summary Of Significant Accounting Policies [Line Items]
Unrealized gain from original cost basis	1,700
Original cost basis	1,500			$ 10,800
Available-for-sale securities sold	6,000	2,600	$ 600
Unrealized loss recognized on available-for-sale securities	(400)
Nicox [Member] | Initial Value [Member]
Summary Of Significant Accounting Policies [Line Items]
Available-for-sale securities	12,500
Recurring [Member]
Summary Of Significant Accounting Policies [Line Items]
Available-for-sale securities	1,100
Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Summary Of Significant Accounting Policies [Line Items]
Available-for-sale securities	$ 32	$ 1,098