Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Accumulated Loss [Member]	Capital Units [Member]	Noncontrolling Interest [Member]	Parent Company [Member]	Parent Company [Member] Common Stock [Member]	Parent Company [Member] Treasury Stock [Member]	Parent Company [Member] Additional Paid-in Capital [Member]	Parent Company [Member] Accumulated Loss [Member]	Parent Company [Member] Accumulated Other Comprehensive Loss [Member]
Beginning Balance at Dec. 31, 2015	$ 1,775,762			$ 944,262	$ 831,500	$ 747	$ (1,577)	$ 982,814	$ (77,159)	$ (73,325)
Balance, shares at Dec. 31, 2015						74,709,442	(65,301)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A common stock under equity incentive award plan	0					$ 3		(3)
Issuance of Class A common stock under equity incentive award plan, shares						287,904
Repurchase of shares for employee tax withholding	(40)				(40)		$ (40)
Repurchase of shares for employee tax withholding, shares							(2,043)
Stock-based compensation	2,777				2,777			2,777
Dividends declared	(57,810)				(57,810)			(57,810)
Distributions to noncontrolling interests	(8,187)	$ 0	$ (8,187)	(8,187)
Other	(435)			(469)	34			34
Net loss	(44,694)			(17,801)	(26,893)				(26,893)
Other comprehensive loss, net of tax	(21,847)			(1,135)	(20,712)					(20,712)
Ending Balance at Jun. 30, 2016	1,645,526			916,670	728,856	$ 750	$ (1,617)	927,812	(104,052)	(94,037)
Balance, shares at Jun. 30, 2016						74,997,346	(67,344)
Beginning Balance at Dec. 31, 2016	1,878,744			891,246	987,498	$ 875	$ (2,500)	1,145,760	(94,270)	(62,367)
Balance, shares at Dec. 31, 2016						87,521,651	(110,964)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A common stock under equity incentive award plan	0					$ 3		(3)
Issuance of Class A common stock under equity incentive award plan, shares						231,311
Repurchase of shares for employee tax withholding	(97)				(97)		$ (97)
Repurchase of shares for employee tax withholding, shares							(4,182)
Stock-based compensation	2,768				2,768			2,768
Dividends declared	(72,934)				(72,934)			(72,934)
Noncontrolling Interest, Increase from Business Combination	325,600	0	325,600	325,600
Distributions to noncontrolling interests	(9,164)	$ 0	$ (9,164)	(9,164)
Other	(270)			(127)	(143)			(143)
Net loss	(12,145)			(32,018)	19,873				19,873
Other comprehensive loss, net of tax	15,212			(107)	15,319					15,319
Ending Balance at Jun. 30, 2017	$ 2,127,714			$ 1,175,430	$ 952,284	$ 878	$ (2,597)	$ 1,075,448	$ (74,397)	$ (47,048)
Balance, shares at Jun. 30, 2017						87,752,962	(115,146)