Condensed Consolidated Statements of Changes in Owners' Equity Statement - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]
Beginning balance at Dec. 31, 2017	$ 1,658,365	$ 786	$ 1,770,117	$ (8,031)	$ (50,706)	$ (53,801)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | Accounting Standards Update 2014-09 [Member]	11,513				11,513
Net income (loss)	(33,035)				(33,035)
Other Comprehensive Income (Loss), Net of Tax	18,171	0	0	0	0	18,171
Dividends	(37,230)		(37,230)
Dividends, Share-based Compensation, Cash	53		53
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	2,149		2,149
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	558	1	557
Treasury Stock, Retired, Cost Method, Amount		(2)		8,031	(8,029)
Treasury Stock, Value, Acquired, Cost Method	(381)			(381)
Ending balance at Mar. 31, 2018	1,620,163	785	1,735,646	(381)	(80,257)	(35,630)
Beginning balance at Dec. 31, 2018	1,840,321	786	1,615,969	(705)	(73,971)	(51,247)	$ 349,489
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | Accounting Standards Update 2018-02 [Member]					10,884	(10,884)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | Accounting Standards Update 2016-02 [Member]	162				162
Net income (loss)	(3,314)				(6,839)		3,525
Other Comprehensive Income (Loss), Net of Tax	(14,233)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(3,349)	0	0	0	0	(8,929)	5,580
Dividends	(44,824)		(44,824)
Dividends, Share-based Compensation, Cash	844		844
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	2,632		2,632
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	290	4	286				0
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	372,944		(64,525)				437,469
Preferred Stock, Accretion of Redemption Discount	(26,959)		(13,749)				(13,210)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(7,580)						(7,580)
Treasury Stock, Value, Acquired, Cost Method	(680)			(680)
Ending balance at Mar. 31, 2019	$ 2,130,487	$ 790	$ 1,496,633	$ (1,385)	$ (69,764)	$ (71,060)	$ 775,273