Fair Values of Financial and Nonfinancial Instruments (Details) $ in Thousands	Jun. 30, 2015 USD ($) loan	Dec. 31, 2014 USD ($) loan
Fair value measurement for financial instruments
Senior notes and convertible senior notes, net	$ 1,271,158	$ 1,397,308
Marketable securities, available-for-sale	17,791	17,845
Mortgage loans held-for-sale, unpaid principal balance	126,900	147,900
Mortgage loans held-for-sale, difference between the aggregate fair value and the aggregate unpaid principal balance	$ 2,900	$ 5,400
Number of loans 90 days or more past due \| loan	1	1
Mortgage loans held-for-sale, aggregate carrying value of loans with payments 90 days or more past due	$ 218	$ 219
Mortgage loans held-for-sale, aggregate unpaid principal balance of loans with payments 90 days or more past due	339	340
U.S. Treasury securities
Fair value measurement for financial instruments
Marketable securities, available-for-sale	450	350
Municipal debt securities
Fair value measurement for financial instruments
Marketable securities, available-for-sale	9,815	9,984
Time deposits
Fair value measurement for financial instruments
Marketable securities, available-for-sale	7,526	7,511
Recurring Measurement \| Level 1 \| U.S. Treasury securities
Fair value measurement for financial instruments
Marketable securities, available-for-sale	450	350
Recurring Measurement \| Level 2 \| Mortgage loans held-for-sale
Fair value measurement for financial instruments
Derivative assets	129,790	153,366
Recurring Measurement \| Level 2 \| Mortgage interest rate lock commitments
Fair value measurement for financial instruments
Derivative assets	8,034	4,229
Recurring Measurement \| Level 2 \| Forward-delivery contracts
Fair value measurement for financial instruments
Derivative assets	1,927	(2,141)
Recurring Measurement \| Level 2 \| Municipal debt securities
Fair value measurement for financial instruments
Marketable securities, available-for-sale	9,815	9,984
Recurring Measurement \| Level 2 \| Time deposits
Fair value measurement for financial instruments
Marketable securities, available-for-sale	7,526	7,511
Carrying value
Fair value measurement for financial instruments
Senior notes and convertible senior notes, net	1,300,000	1,400,000
Fair Value
Fair value measurement for financial instruments
Senior notes and convertible senior notes, net	$ 1,400,000	$ 1,500,000

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- Definition

The number of mortgage loans that are equal to or greater than 90 days past due.

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The aggregate unpaid principal balance outstanding of mortgage loans held-for-sale.

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Net carrying value as of the balance sheet date of notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Fair value, after the effects of master netting arrangements, of a 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. Includes assets not subject to a master netting arrangement and not elected to be offset.

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This item represents the aggregate fair value of loans held as assets that are 90 days or more past due for which the fair value option has been elected.

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For loans held as assets for which the fair value option has been elected, this item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of those loans that are 90 days or more past due, in nonaccrual status, or both.

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Amount of principal due on loans that have been delinquent, which may exclude loans having interest delinquent for three months or less, as of the balance sheet date.

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