Consolidated Statement of Shareholders' Equity Statement - 6 months ended Jun. 30, 2015 - USD ($) $ in Thousands	Total	Common Stock [Member]	Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income [Member]
Balances at Dec. 31, 2014	$ 590,630	$ 450	$ 806,810	$ (226,850)	$ 10,220
Net income attributable to TriMas Corporation	15,690			15,690
Other comprehensive income (loss)	(3,640)				(3,640)
Shares surrendered upon vesting of options and restricted stock awards to cover tax obligations	(2,620)		(2,620)
Stock option exercises and restricted stock vesting	430	0	430
Excess tax benefits from stock based compensation	270		270
Non-cash compensation expense	3,560		3,560
Distribution of the Cequent businesses	(2,180)			6,130	(8,310)
Balances at Jun. 30, 2015	$ 602,140	$ 450	$ 808,450	$ (205,030)	$ (1,730)