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	0	0	0	11,513	0
Net income (loss)	(35,761)	0	0	0	(35,761)	0
Other Comprehensive Income (Loss), Net of Tax	24,351	0	0	0	0	24,351
Dividends	(74,423)	0	(74,423)	0	0	0
Preferred Stock Dividends, Income Statement Impact	(4,830)	0	(4,830)	0	0	0
Dividend, Share-based Payment Arrangement, Cash	(64)	0	(64)	0	0	0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	5,545	0	5,545	0	0	0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	521	1	520	0	0	0
Proceeds from Noncontrolling Interests	0
Treasury Stock, Retired, Cost Method, Amount	0	(2)	0	8,031	(8,029)	0
Treasury Stock, Value, Acquired, Cost Method	(699)	0	0	(699)	0	0
Ending balance at Jun. 30, 2018	1,584,518	785	1,696,865	(699)	(82,983)	(29,450)
Beginning balance at Mar. 31, 2018	1,620,163	785	1,735,646	(381)	(80,257)	(35,630)
Net income (loss)	(2,726)	0	0	0	(2,726)	0
Other Comprehensive Income (Loss), Net of Tax	6,180	0	0	0	0	6,180
Dividends	(37,193)	0	(37,193)	0	0	0
Preferred Stock Dividends, Income Statement Impact	(4,830)	0	(4,830)	0	0	0
Dividend, Share-based Payment Arrangement, Cash	(117)	0	(117)	0	0	0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	3,396	0	3,396	0	0	0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(37)	0	(37)	0	0	0
Treasury Stock, Value, Acquired, Cost Method	(318)	0	0	(318)	0	0
Ending balance at Jun. 30, 2018	1,584,518	785	1,696,865	(699)	(82,983)	(29,450)
Beginning balance at Dec. 31, 2018	1,840,321	786	1,615,969	(705)	(73,971)	(51,247)	$ 349,489
Ending balance at Mar. 31, 2019	2,130,487	790	1,496,633	(1,385)	(69,764)	(71,060)	775,273
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]	0	0	0	0	10,884	(10,884)	0
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | Accounting Standards Update 2016-02 [Member]	162	0	0	0	162	0	0
Net income (loss)	(16,212)	0	0	0	(32,426)	0	16,214
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	24,038	0	0	0	0	10,440	13,598
Other Comprehensive Income (Loss), Net of Tax	13,154
Dividends	(75,736)	0	(75,736)	0	0	0	0
Preferred Stock Dividends, Income Statement Impact	(12,970)		(12,970)
Dividend, Share-based Payment Arrangement, Cash	884	0	884	0	0	0	0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	4,864	0	4,864	0	0	0	0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	290	4	286	0	0	0	0
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	383,918	0	(64,525)	0	0	0	448,443
Dividends, Subsidiary Preferred Stock, Paid-in-kind	(2,171)		(1,107)				(1,064)
Preferred Stock, Accretion of Redemption Discount	(27,424)	0	(13,986)	0	0	0	(13,438)
Proceeds from Noncontrolling Interests	70,521						70,521
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(72,423)	0	0	0	0	0	(72,423)
Treasury Stock, Value, Acquired, Cost Method	(716)	0	0	(716)	0	0	0
Ending balance at Jun. 30, 2019	2,117,346	790	1,453,679	(1,421)	(95,351)	(51,691)	811,340
Beginning balance at Mar. 31, 2019	2,130,487	790	1,496,633	(1,385)	(69,764)	(71,060)	775,273
Net income (loss)	(12,898)	0	0	0	(25,587)	0	12,689
Other Comprehensive Income (Loss), Net of Tax	27,387	0	0	0	0	19,369	8,018
Dividends	(37,341)	0	(37,341)	0	0	0	0
Preferred Stock Dividends, Income Statement Impact	(6,541)	0	(6,541)	0	0	0	0
Dividend, Share-based Payment Arrangement, Cash	40	0	40	0	0	0	0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	2,232	0	2,232	0	0	0	0
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	10,974	0	0	0	0	0	10,974
Dividends, Subsidiary Preferred Stock, Paid-in-kind	(2,171)	0	(1,107)	0	0	0	(1,064)
Preferred Stock, Accretion of Redemption Discount	(465)	0	(237)	0	0	0	(228)
Proceeds from Noncontrolling Interests	70,521	0	0	0	0	0	70,521
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(64,843)	0	0	0	0	0	(64,843)
Treasury Stock, Value, Acquired, Cost Method	(36)	0	0	(36)	0	0	0
Ending balance at Jun. 30, 2019	$ 2,117,346	$ 790	$ 1,453,679	$ (1,421)	$ (95,351)	$ (51,691)	$ 811,340