Consolidated Statement of Stockholders’ Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income(Loss)	Total
Balance at the beginning of the period at Dec. 31, 2015					$ (61,505)
Increase (Decrease) in Stockholders' Equity
Net income						$ 36,968
Other comprehensive income					1,153
Balance at the end of the period at Mar. 31, 2016					(60,352)
Balance at the beginning of the period at Dec. 31, 2016	$ 997	$ 291,908	$ 1,135,694	$ (531,268)	(53,329)	844,002
Balance (in shares) at Dec. 31, 2016	99,701
Increase (Decrease) in Stockholders' Equity
Adoption of share-based compensation guidance on January 1, 2017		3,504	(2,200)			1,304
Net income			33,056			33,056
Recognition of equity compensation		12,928	228			13,156
Issuance of restricted share and other		(34,194)		34,194
Dividends accrued, $0.46 per share			(39,043)			(39,043)
Repurchase of common stock				(7,976)		(7,976)
Other comprehensive income					4,385	4,385
Balance at the end of the period at Mar. 31, 2017	$ 997	$ 274,146	$ 1,127,735	$ (505,050)	$ (48,944)	848,884
Balance (in shares) at Mar. 31, 2017	99,701
Balance at the beginning of the period at Dec. 31, 2016						10,653
Increase (Decrease) in Redeemable Noncontrolling Interest
Net income						480
Net redemption and deconsolidation of redeemable noncontrolling interests in sponsored funds						(2,617)
Balance at the end of the period at Mar. 31, 2017						$ 8,516