Fair Value Measurements - Notional Amounts and Fair Values of Derivatives by Product (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands		Dec. 31, 2016		Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivatives asset, Notional		$ 297,727	[1]	$ 323,108	[2]
Derivatives asset, Fair Value		1,663	[1]	15,609	[2]
Derivative liability, notional		4,756,631	[1]	3,268,047	[2]
Derivative liability, Fair Value		2,024	[1]	14,162	[2]
Other Contracts | TBA
Derivatives, Fair Value [Line Items]
Derivatives asset, Notional		169,500	[1]	35,650	[2]
Derivatives asset, Fair Value		332	[1]	4	[2]
Derivative liability, notional		169,500	[1]	24,350	[2]
Derivative liability, Fair Value		289	[1]	5	[2]
Other Contracts | TBA Sale Agreements
Derivatives, Fair Value [Line Items]
Derivatives asset, Notional		121,573	[1]	83,810	[2]
Derivatives asset, Fair Value		482	[1]	6,444	[2]
Derivative liability, notional	[1]			223,846
Derivative liability, Fair Value	[1]			11,614
Other Contracts | Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Derivative liability, notional	[1]	200		400
Derivative liability, Fair Value	[1]	1		2
Other Contracts | Auction Rate Securities Purchase Commitment
Derivatives, Fair Value [Line Items]
Derivatives asset, Notional	[1]	6,654
Derivatives asset, Fair Value	[1]	849
Derivative liability, notional		24,358	[1]	27,813	[2]
Derivative liability, Fair Value		645	[1]	1,369	[2]
Other Contracts | TBA Purchase Agreements [Member] [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, notional	[1]	121,573
Derivative liability, Fair Value	[1]	923
Other Contracts | Forward Start Repurchase Agreement [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, notional	[1]	382,000
Derivative liability, Fair Value	[1]	0
Other Contracts | Interest Rate Lock Commitments [Member]
Derivatives, Fair Value [Line Items]
Derivatives asset, Notional	[2]			203,648
Derivatives asset, Fair Value	[2]			9,161
Derivative liability, notional	[2]			48,638
Derivative liability, Fair Value	[2]			923
Commodity Contracts | Futures
Derivatives, Fair Value [Line Items]
Derivative liability, notional		4,059,000	[1],[3]	2,943,000	[2],[4]
Derivative liability, Fair Value		$ 166	[1],[3]	$ 249	[2],[4]

[1] )See "Derivative Instruments and Hedging Activities" above for description of derivative financial instruments. Such derivative instruments are not subject to master netting agreements, thus the related amounts are not offse

[2] )See "Derivative Instruments and Hedging Activities" above for description of derivative financial instruments. Such derivative instruments are not subject to master netting agreements, thus the related amounts are not offse

[3] e

[4] For the year ended December 31, 2016, the diluted earnings per share computation does not include the anti-dilutive effect of 1,237,134 shares of Class A Stock granted under share-based compensation arrangements (1,269,585 and 43,008 shares for the years ended December 31, 2015 and 2014, respectively).(2)Represents net income from discontinued operations less net income attributable to noncontrolling interest, net of tax divided by weighted average number of shares outstanding.