Consolidated Statements of Changes in Stockholders' Equity and Redeemable Noncontrolling Interest - USD ($) shares in Thousands, $ in Thousands	Total	Common stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss), Net of Tax	Treasury Stock	Total Stockholders' Equity	Redeemable Noncontrolling Interest
Beginning balance at Dec. 31, 2016		$ 504	$ 543,829	$ (127,957)	$ (5,885)	$ (144,677)	$ 265,814
Beginning balance (redeemable noncontrolling interest) at Dec. 31, 2016								$ 853
Beginning balance (shares of common stock, net) at Dec. 31, 2016		45,890
Dividends		$ 0	0	(101,669)	0	0	(101,669)
Issuance of common stock		$ 7	741	0	0	0	748	0
Issuance of common stock, shares		690
Repurchase of common stock		$ 0	0	0	0	(9,141)	(9,141)	0
Repurchase of common stock, shares		(265)
Issuance of restricted stock units		$ 0	3,974	0	0	0	3,974	0
Amortization of restricted stock units		0	22,042	(285)	0	0	21,757	0
Forfeitures of vested restricted stock units		0	(100)	0	0	0	(100)	0
Net income (loss)	$ 92,486	0	0	91,939	0	0	91,939	547
Other comprehensive income (loss)	2,214	0	0	0	2,214	0	2,214	0
Net contributions (distributions) attributable to redeemable noncontrolling interests	46,658	0	0	0	0	0	0	46,395
Ending balance at Dec. 31, 2017		$ 511	570,486	(137,972)	(3,671)	(153,818)	275,536
Ending balance (shares of common stock, net) at Dec. 31, 2017		46,315
Ending balance (redeemable noncontrolling interest) at Dec. 31, 2017								47,795
Dividends		$ 0	0	(185,423)	0	0	(185,423)
Issuance of common stock		$ 7	696	0	0	0	703	0
Issuance of common stock, shares		714
Repurchase of common stock		$ 0	0	0	0	(10,599)	(10,599)	0
Repurchase of common stock, shares		(261)
Issuance of restricted stock units		$ 0	7,170	0	0	0	7,170	0
Amortization of restricted stock units		0	23,984	0	0	0	23,984	0
Forfeitures of vested restricted stock units		0	(64)	0	0	0	(64)	0
Net income (loss)	109,522	0	0	113,896	0	0	113,896	(4,374)
Other comprehensive income (loss)	(2,557)	0	0	0	(2,557)	0	(2,557)	0
Net contributions (distributions) attributable to redeemable noncontrolling interests	81,633	0	0	0	0	0	0	70,771
Ending balance at Dec. 31, 2018	222,646	$ 518	602,272	(208,404)	(7,323)	(164,417)	222,646
Ending balance (shares of common stock, net) at Dec. 31, 2018		46,768
Ending balance (redeemable noncontrolling interest) at Dec. 31, 2018								114,192
Cumulative Effect of New Accounting Principle in Period of Adoption				1,095	(1,095)
Dividends		$ 0	0	(168,678)	0	0	(168,678)
Issuance of common stock		$ 9	861	0	0	0	870	0
Issuance of common stock, shares		762
Repurchase of common stock		$ 0	0	0	0	(10,408)	(10,408)	0
Repurchase of common stock, shares		(280)
Issuance of restricted stock units		$ 0	7,039	0	0	0	7,039	0
Amortization of restricted stock units		0	26,883	0	0	0	26,883	0
Forfeitures of vested restricted stock units		0	(267)	0	0	0	(267)	0
Net income (loss)	146,984	0	0	134,621	0	0	134,621	12,363
Other comprehensive income (loss)	997	0	0	0	997	0	997	0
Net contributions (distributions) attributable to redeemable noncontrolling interests	45,725	0	0	0	0	0	0	2,242
Net consolidation (deconsolidation) of Company-sponsored funds		0	0	0	0	0	0	(75,385)
Ending balance at Dec. 31, 2019	$ 213,703	$ 527	$ 636,788	$ (242,461)	$ (6,326)	$ (174,825)	$ 213,703
Ending balance (shares of common stock, net) at Dec. 31, 2019		47,250
Ending balance (redeemable noncontrolling interest) at Dec. 31, 2019								$ 53,412