CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Common Stock Issued	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest [Member]
Balances at Dec. 31, 2013	$ 597,555	$ 140,248	$ (746,237)	$ 159,025	$ 1,372,041	$ (370,615)	$ 43,093
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(17,676)				(22,171)		4,495
Cash dividends declared:
Common @ $0.82 per share and $0.666 per share in 2014, and 2015, respectively	(66,321)				(66,321)
Noncontrolling interests	(2,319)						(2,319)
Total other comprehensive income (loss), net of deferred income taxes of $24,364, $(1,836), and $(14,196) in 2014, 2015, and 2016 respectively	(163,243)					(161,641)	(1,602)
Contributions from noncontrolling interests	1,560						1,560
Noncontrolling interests transferred in the Infrastructure Transaction	(905)						(905)
Vesting of restricted stock units and other stock grants, net 130,925 shares, 31,147 shares and 80,598 shares in 2014, 2015 and 2016, respectively	1,551	196	(714)	2,069
Treasury shares repurchased, 150,000 and 596,632 shares in 2014 and 2015 respectively	(2,864)		(2,864)
Amortization of unearned stock-based compensation, net of forfeitures	4,572			4,572
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 @ $0.82 per share and $0.666 per share in 2014, and 2015, respectively	(53,382)				(53,382)
Noncontrolling interests	(4,498)						(4,498)
Total other comprehensive income (loss), net of deferred income taxes of $24,364, $(1,836), and $(14,196) in 2014, 2015, and 2016 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 130,925 shares, 31,147 shares and 80,598 shares in 2014, 2015 and 2016, respectively	(304)	59	(264)	(99)
Treasury shares repurchased, 150,000 and 596,632 shares in 2014 and 2015 respectively	(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 $24,364, $(1,836), and $(14,196) in 2014, 2015, and 2016 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 130,925 shares, 31,147 shares and 80,598 shares in 2014, 2015 and 2016, 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