Investments and Fair Value Measurements (Fair Value Measurements) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2016	Dec. 31, 2015
Assets:
Investment securities available for sale	$ 175,653	$ 181,976
Liabilities:
Fair value of derivatives embedded within convertible debt	120,820	144,042
Long-term investments	54,005	62,726
Investments in real estate, net	23,630	23,318
5.5% Variable Interest Senior Convertible Debentures due 2020 \| Convertible Debt
Liabilities:
Fair value of derivatives embedded within convertible debt	$ 62,919	71,959
Interest rate	5.50%
Equity securities
Assets:
Investment securities available for sale	$ 57,948	67,273
Mutual funds invested in fixed income securities
Assets:
Investment securities available for sale	20,667	20,111
Fair Value, Measurements, Recurring
Assets:
Investment securities available for sale	175,653	181,976
Total	525,419	292,127
Liabilities:
Fair value of derivatives embedded within convertible debt	120,820	144,042
Fair Value, Measurements, Recurring \| Equity securities
Assets:
Investment securities available for sale	57,948	67,273
Fair Value, Measurements, Recurring \| Mutual funds invested in fixed income securities
Assets:
Investment securities available for sale	20,667	20,111
Fair Value, Measurements, Recurring \| U.S. Government securities
Assets:
Investment securities available for sale	30,985	28,132
Fair Value, Measurements, Recurring \| Corporate securities
Assets:
Investment securities available for sale	35,669	41,561
Fair Value, Measurements, Recurring \| U.S. mortgage-backed securities
Assets:
Investment securities available for sale	8,293	5,790
Fair Value, Measurements, Recurring \| Commercial mortgage-backed securities
Assets:
Investment securities available for sale	1,776	8,728
Fair Value, Measurements, Recurring \| U.S. asset-backed securities
Assets:
Investment securities available for sale	891	8,276
Fair Value, Measurements, Recurring \| Commercial paper
Assets:
Investment securities available for sale	19,424
Fair Value, Measurements, Recurring \| Index-linked U.S. bonds
Assets:
Investment securities available for sale		2,105
Fair Value, Measurements, Recurring \| Fixed income securities
Assets:
Investment securities available for sale	97,038	94,592
Fair Value, Measurements, Recurring \| Money market funds
Assets:
Cash and cash equivalents	310,826	93,915
Fair Value, Measurements, Recurring \| Commercial paper
Assets:
Cash and cash equivalents	30,704
Fair Value, Measurements, Recurring \| Certificates of deposit
Assets:
Cash and cash equivalents	2,978	3,469
Fair Value, Measurements, Recurring \| Bonds
Assets:
Cash and cash equivalents	5,258	12,767
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investment securities available for sale	78,615	87,384
Total	394,699	194,066
Liabilities:
Fair value of derivatives embedded within convertible debt	0	0
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Equity securities
Assets:
Investment securities available for sale	57,948	67,273
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Mutual funds invested in fixed income securities
Assets:
Investment securities available for sale	20,667	20,111
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| U.S. Government securities
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Corporate securities
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| U.S. mortgage-backed securities
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Commercial mortgage-backed securities
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| U.S. asset-backed securities
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Commercial paper
Assets:
Investment securities available for sale	0
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Index-linked U.S. bonds
Assets:
Investment securities available for sale		0
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Fixed income securities
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Money market funds
Assets:
Cash and cash equivalents	310,826	93,915
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Commercial paper
Assets:
Cash and cash equivalents	0
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Certificates of deposit
Assets:
Cash and cash equivalents	0	0
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Bonds
Assets:
Cash and cash equivalents	5,258	12,767
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2)
Assets:
Investment securities available for sale	97,038	94,592
Total	130,720	98,061
Liabilities:
Fair value of derivatives embedded within convertible debt	0	0
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Equity securities
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Mutual funds invested in fixed income securities
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| U.S. Government securities
Assets:
Investment securities available for sale	30,985	28,132
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Corporate securities
Assets:
Investment securities available for sale	35,669	41,561
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| U.S. mortgage-backed securities
Assets:
Investment securities available for sale	8,293	5,790
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Commercial mortgage-backed securities
Assets:
Investment securities available for sale	1,776	8,728
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| U.S. asset-backed securities
Assets:
Investment securities available for sale	891	8,276
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Commercial paper
Assets:
Investment securities available for sale	19,424
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Index-linked U.S. bonds
Assets:
Investment securities available for sale		2,105
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Fixed income securities
Assets:
Investment securities available for sale	97,038	94,592
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Money market funds
Assets:
Cash and cash equivalents	0	0
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Commercial paper
Assets:
Cash and cash equivalents	30,704
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Certificates of deposit
Assets:
Cash and cash equivalents	2,978	3,469
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Bonds
Assets:
Cash and cash equivalents	0	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3)
Assets:
Investment securities available for sale	0	0
Total	0	0
Liabilities:
Fair value of derivatives embedded within convertible debt	120,820	144,042
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Equity securities
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Mutual funds invested in fixed income securities
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| U.S. Government securities
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Corporate securities
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| U.S. mortgage-backed securities
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Commercial mortgage-backed securities
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| U.S. asset-backed securities
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Commercial paper
Assets:
Investment securities available for sale	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Index-linked U.S. bonds
Assets:
Investment securities available for sale		0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Fixed income securities
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Money market funds
Assets:
Cash and cash equivalents	0	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Commercial paper
Assets:
Cash and cash equivalents	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Certificates of deposit
Assets:
Cash and cash equivalents	0	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Bonds
Assets:
Cash and cash equivalents	0	0
Fair Value, Measurements, Nonrecurring
Liabilities:
Long-term investments, fair value	6,396	11,189
Real estate held for sale, fair value		3,780
Nonrecurring nonfinancial assets subject to fair value measurements		14,969
Gain (loss) on long-term investments	(1,203)	(811)
Gain (loss) on real estate held for sale		(230)
Gain (loss) on long-term investments and real estate held for sale		(1,041)
Impairment charge included in earnings	1,203	811
Long-term investments	7,599	12,000
Investments in real estate, net		4,010
Impairment of real estate		230
Fair Value, Measurements, Nonrecurring \| Significant Unobservable Inputs (Level 3)
Liabilities:
Long-term investments, fair value	$ 6,396	11,189
Real estate held for sale, fair value		3,780
Nonrecurring nonfinancial assets subject to fair value measurements		$ 14,969

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value portion of assets classified as held for sale.

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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 portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

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Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

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The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

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Amount of real estate owned for income production and capital accretion potential, not otherwise specified in the existing taxonomy. Such real estate excludes that which is occupied or used in the business, for entertainment purposes, or held in inventory for specific purposes.

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