Revenue Recognition (Balance Sheet Impact) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Assets:
Accounts receivable, net	$ 358,982	$ 418,911	$ 412,798
Inventories	330,516	243,526	245,894
Other non-current assets	94,047	66,133	61,789
Liabilities:
Accounts payable	168,155	111,759	111,915
Other accrued liabilities	282,410	267,951	222,470
Deferred revenue	35,485	30,103	55,284
Income taxes payable	6,853	7,739	7,015
Other non-current liabilities	53,499	21,823	22,099
Stockholders’ equity:
Retained earnings	124,488	115,665	128,168
Non-controlling interest	24,301		0
Balance without adoption of ASC 606
Assets:
Accounts receivable, net	345,835		412,798
Inventories	333,007		245,894
Other non-current assets	90,474		61,789
Liabilities:
Accounts payable	168,265		111,915
Other accrued liabilities	229,214		222,470
Deferred revenue	53,811		55,284
Income taxes payable	8,407		7,015
Other non-current liabilities	55,383		22,099
Stockholders’ equity:
Retained earnings	141,249		$ 128,168
Non-controlling interest	24,633
Adjustments | Accounting Standards Update 2014-09
Assets:
Accounts receivable, net	(13,147)	6,113
Inventories	2,491	(2,368)
Other non-current assets	(3,573)	4,344
Liabilities:
Accounts payable	110	(156)
Other accrued liabilities	(53,196)	45,481
Deferred revenue	18,326	(25,181)
Income taxes payable	1,554	724
Other non-current liabilities	1,884	(276)
Stockholders’ equity:
Retained earnings	16,761	$ (12,503)
Non-controlling interest	$ 332