CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands		Total	Common Stock Issued	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Balances at Dec. 31, 2014		$ 351,910	$ 140,444	$ (749,815)	$ 165,666	$ 1,283,549	$ (532,256)	$ 44,322
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		6,332				6,188		144
Cash dividends declared:
Common @ $0.666 per share in 2015	[1]	(53,382)				(53,382)
Noncontrolling interests		(4,498)						(4,498)
Total other comprehensive income (loss), net of deferred income taxes of $(1,836), $(14,196), and $(1,384) in 2015, 2016, and 2017 respectively		13,928					16,568	(2,640)
Contributions from noncontrolling interests		2,100						2,100
Purchase of subsidiary shares from noncontrolling interest		398			(3)			(395)
Sale of investment in consolidated subsidiary		200						200
Vesting of restricted stock units and other stock grants, net 31,147 shares, 80,598 shares and 269,924 shares in 2015, 2016 and 2017, respectively		(304)	59	(264)	(99)
Treasury shares repurchased, 596,632 shares in 2015		(10,220)		(10,220)
Amortization of unearned stock-based compensation, net of forfeitures		5,135			5,135
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 [Roll Forward]
Net income (loss)		(79,753)				(85,667)		5,914
Cash dividends declared:
Noncontrolling interests		(1,702)						1,702
Total other comprehensive income (loss), net of deferred income taxes of $(1,836), $(14,196), and $(1,384) in 2015, 2016, and 2017 respectively		(93,614)					(91,034)	(2,580)
Purchase of subsidiary shares from noncontrolling interest		(4,731)			(5,128)			397
Vesting of restricted stock units and other stock grants, net 31,147 shares, 80,598 shares and 269,924 shares in 2015, 2016 and 2017, respectively		(1,164)	122	(92)	(1,194)
Amortization of unearned stock-based compensation, net of forfeitures		7,724			7,724
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 [Roll Forward]
Cumulative Effect of New Accounting Principle in Period of Adoption		397			1,106	(709)
Net income (loss)		11,844				7,822		4,022
Cash dividends declared:
Noncontrolling interests		(2,445)						(2,445)
Total other comprehensive income (loss), net of deferred income taxes of $(1,836), $(14,196), and $(1,384) in 2015, 2016, and 2017 respectively		63,184					60,140	3,044
Purchase of subsidiary shares from noncontrolling interest		(3,436)			(2,242)			(1,194)
Sale of investment in consolidated subsidiary		25						25
Stock Appreciation Rights exercised, net 8,965 shares		(63)	16	(63)	(16)
Vesting of restricted stock units and other stock grants, net 31,147 shares, 80,598 shares and 269,924 shares in 2015, 2016 and 2017, respectively		(1,625)	469	(1,625)	(469)
Amortization of unearned stock-based compensation, net of forfeitures		9,721			9,721
Balances at Dec. 31, 2017		$ 215,165	$ 141,110	$ (762,079)	$ 180,201	1,157,801	$ (546,582)	$ 44,714
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect of New Accounting Principle in Period of Adoption						$ (1,000)

[1] In November 2015, the Company reduced the quarterly dividend to $0.051 per share.