Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Noncontrolling Interest [Member]	Accumulated Other Comprehensive Loss
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 408,971
Beginning Balance, Issued Shares at Dec. 31, 2015	33,416,110	33,416,110
Beginning Balance, Value at Dec. 31, 2015	$ 408,971	$ 3,342	$ 57,120	$ 378,787	$ 0	$ (30,278)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	69,218			69,218	0
Net Income (Loss) Attributable to Noncontrolling Interest	133				133
Cumulative translation adjustment	(1,013)					(1,013)
Repurchase and retirement of common stock, Shares		(1,097,390)
Repurchase and retirement of common stock, Value	(42,955)	$ (110)	(42,845)
Vesting of restricted stock, Shares		53,282
Vesting of restricted stock, Value	0	$ 6	(6)
Exercise of stock options, Shares		13,500
Exercise of stock options, Value	29	$ 1	28
Share based compensation	2,078		2,078
Forfeiture of certain shares to satisfy exercise costs and the recipients income tax obligations related to stock options exercised and restricted stock vested, Shares		(3,340)
Forfeiture of certain shares to satisfy exercise costs and the recipients income tax obligations related to stock options exercised and restricted stock vested	(147)	$ (1)	(146)
Recognized controlling ownership of joint venture	11,293		0	0	11,293
Dividends paid	$ (7,401)			(7,401)
Ending Balance, Issued Shares at Sep. 30, 2016	32,382,162	32,382,162
Ending Balance, Value at Sep. 30, 2016	$ 428,780	$ 3,238	$ 16,229	$ 440,604	$ 11,426	$ (31,291)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 440,206