Condensed Consolidated Statements of Equity (unaudited) - USD ($) $ in Thousands	Total	Common Stock	Common Stock - Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Noncontrolling Interest
Beginning Balance at Dec. 31, 2014	$ 778,662	$ 4	$ 453,109	$ 321,083	$ (11)	$ (4,412)	$ 8,889
Beginning Balance, shares at Dec. 31, 2014		44,422,881
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock	412		412
Issuance of common stock, shares		37,966
Treasury stock purchases	(5,000)					(5,000)
Treasury stock purchases, shares		(525,281)
Acquisition of noncontrolling interest	(4,064)						(4,064)
Stock compensation expense	1,080		1,080
Other comprehensive income	(4,632)				(4,632)
Net income (loss)	(38,304)			(38,107)			(197)
Ending Balance at Mar. 31, 2015	728,154	$ 4	454,601	282,976	(4,643)	(9,412)	4,628
Ending Balance, Shares at Mar. 31, 2015		43,935,566
Beginning Balance at Dec. 31, 2015	614,010	$ 4	474,367	169,680	(4,009)	(28,762)	2,730
Beginning Balance, shares at Dec. 31, 2015		43,837,714
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock	316		316
Issuance of common stock, shares		33,973
Issuance of common stock in acquisition	4,050	$ 1	4,049
Issuance of common stock in acquisition, shares		500,000
Treasury stock purchases	(5,817)					(5,817)
Treasury stock purchases, shares		(647,794)
Acquisition of noncontrolling interest	(179)						(179)
Stock compensation expense	1,076		1,076
Other comprehensive income	1,664				1,579		85
Net income (loss)	1,686			1,656			30
Ending Balance at Mar. 31, 2016	$ 616,806	$ 5	$ 479,808	$ 171,336	$ (2,430)	$ (34,579)	$ 2,666
Ending Balance, Shares at Mar. 31, 2016		43,723,893