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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
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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.

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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959 + Details
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- Definition Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226006-175313 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=d3e41678-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=d3e41678-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226006-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 + Details
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