Federal Income Taxes - Income and Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Contingency [Line Items]
TRS (loss) income before income taxes									$ 52,522	$ 62,694	$ 138,415
Benefit (provision) for income taxes:
TRS net (loss) income before noncontrolling interests									72,776	65,708	70,865
Noncontrolling interests	$ (14,415)	$ 5,786	$ (8,237)	$ (44,950)	$ 1,019	$ (4,328)	$ (58,963)	$ (21,990)	(61,816)	(84,262)	(81,082)
Net income	$ 34,236	$ 326	$ 26,155	$ 73,875	$ 7,871	$ 18,104	$ 85,458	$ 38,537	134,592	149,970	152,146
TRS [Member]
Income Tax Contingency [Line Items]
TRS (loss) income before income taxes									(1,583)	1,008	(36)
Benefit (provision) for income taxes:
Federal									378	(526)	(377)
State and local									97	(134)	(97)
TRS net (loss) income before noncontrolling interests									(1,108)	348	(510)
Noncontrolling interests									(9)	(208)	(508)
Net income									$ (1,117)	$ 140	$ (1,018)