Business Acquisition (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015	May 18, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill	$ 63,934,000	$ 63,934,000		$ 72,365,000	$ 58,554,000
Kay Flow Industries, Inc.
Business Acquisition [Line Items]
Cash			$ 880,000
Accounts receivable			14,699,000
Inventory			25,094,000
Other assets			6,155,000
Intangibles			53,091,000
Goodwill			47,735,000
Property, plant and equipment			27,478,000
Accounts payable			(12,131,000)
Other current liabilities			(4,866,000)
Other liabilities			(28,706,000)
Total purchase price	$ 0		$ 129,429,000