GRT Acquisition - Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 01, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill	$ 52,705		$ 18,851
GRT Acquisition
Business Acquisition [Line Items]
Cash		$ 8,091
Accounts receivable		2,844
Notes receivable		3,050
Inventory		7,983
Other current assets		981
Property, plant & equipment		46,712
Intangible assets		7,412
Other long-term assets		289
Goodwill		33,861
Accounts payable		(61,570)
Notes payable		(10,122)
Accrued liabilities		(2,866)
Long-term debt		(3,383)
Other long-term liabilities		(940)
Net assets and liabilities assumed		32,342
Noncontrolling shareholder interest		(18,323)
Cooper Tire & Rubber Company consideration		$ 14,019