CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Common Stock Issued	Common Stock Treasury	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Balances at Dec. 31, 2015	$ 310,803	$ 140,503	$ (760,299)	$ 170,699	$ 1,236,355	$ (515,688)	$ 39,233
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(33,893)				(37,042)		3,149
Cash dividends declared: Noncontrolling interests	(1,702)						(1,702)
Total other comprehensive income (loss), net of deferred income taxes of $1,671 and $(9,393) in 2017 and 2016, respectively	26,968					27,386	(418)
Purchase of subsidiary shares from noncontrolling interest	(4,731)			(5,128)			397
Vesting of restricted stock units and other stock grants, net 236,335 shares and 80,598 shares in 2017 and 2016, respectively	(568)	119	(92)	(595)
Amortization of unearned portion of stock-based compensation, net of forfeitures	4,072			4,072
Balances at Jun. 30, 2016	300,949	140,622	(760,391)	169,048	1,199,313	(488,302)	40,659
Increase (Decrease) in Stockholders' Equity
Adoption of new accounting standard (See Note 2)	397			1,106	(709)
Balances at Dec. 31, 2016	137,563	140,625	(760,391)	172,101	1,150,688	(606,722)	41,262
Increase (Decrease) in Stockholders' Equity
Net income (loss)	29,868				27,928		1,940
Cash dividends declared: Noncontrolling interests	(1,769)						(1,769)
Total other comprehensive income (loss), net of deferred income taxes of $1,671 and $(9,393) in 2017 and 2016, respectively	16,521					14,987	1,534
Stock Appreciation Rights exercise, net 7,441 shares	(49)	13	(49)	(13)
Vesting of restricted stock units and other stock grants, net 236,335 shares and 80,598 shares in 2017 and 2016, respectively	(1,277)	401	(1,277)	(401)
Amortization of unearned portion of stock-based compensation, net of forfeitures	5,642			5,642
Balances at Jun. 30, 2017	$ 186,896	$ 141,039	$ (761,717)	$ 178,435	$ 1,177,907	$ (591,735)	$ 42,967