Investments and Fair Value Measurements (Fair Value Measurements) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2017	Dec. 31, 2016
Assets:
Investment securities available for sale	$ 154,645	$ 156,903
Liabilities:
Fair value of derivatives embedded within convertible debt	86,190	112,332
Long-term investments	74,476	53,197
5.5% Variable Interest Senior Convertible Debentures due 2020 \| Convertible Debt
Liabilities:
Fair value of derivatives embedded within convertible debt	$ 49,307	59,433
Interest rate	5.50%
Equity securities
Assets:
Investment securities available for sale	$ 48,088	50,843
Mutual funds invested in fixed income securities
Assets:
Investment securities available for sale	21,023	20,582
Fair Value, Measurements, Recurring
Assets:
Investment securities available for sale	154,645	156,903
Total	458,960	453,924
Liabilities:
Fair value of derivatives embedded within convertible debt	86,190	112,332
Fair Value, Measurements, Recurring \| Equity securities
Assets:
Investment securities available for sale	48,088	50,843
Fair Value, Measurements, Recurring \| Mutual funds invested in fixed income securities
Assets:
Investment securities available for sale	21,023	20,582
Fair Value, Measurements, Recurring \| U.S. Government securities
Assets:
Investment securities available for sale	28,696	30,642
Fair Value, Measurements, Recurring \| Corporate securities
Assets:
Investment securities available for sale	40,372	36,687
Fair Value, Measurements, Recurring \| U.S. mortgage-backed securities
Assets:
Investment securities available for sale	5,089	6,500
Fair Value, Measurements, Recurring \| Commercial mortgage-backed securities
Assets:
Investment securities available for sale	433	1,398
Fair Value, Measurements, Recurring \| Commercial paper
Assets:
Investment securities available for sale	7,976	8,980
Fair Value, Measurements, Recurring \| Index-linked U.S. bonds
Assets:
Investment securities available for sale	2,314	770
Fair Value, Measurements, Recurring \| Foreign fixed-income securities
Assets:
Investment securities available for sale	654	501
Fair Value, Measurements, Recurring \| Fixed income securities
Assets:
Investment securities available for sale	85,534	85,478
Fair Value, Measurements, Recurring \| Money market funds
Assets:
Cash and cash equivalents	254,920	248,552
Fair Value, Measurements, Recurring \| Commercial paper
Assets:
Cash and cash equivalents	42,662	41,247
Fair Value, Measurements, Recurring \| Certificates of deposit
Assets:
Cash and cash equivalents	2,493	2,982
Fair Value, Measurements, Recurring \| Bonds
Assets:
Cash and cash equivalents	4,240	4,240
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investment securities available for sale	69,111	71,425
Total	328,271	324,217
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	48,088	50,843
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	21,023	20,582
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) \| Commercial paper
Assets:
Investment securities available for sale	0	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	0
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Foreign 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) \| 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	254,920	248,552
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Commercial paper
Assets:
Cash and cash equivalents	0	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	4,240	4,240
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2)
Assets:
Investment securities available for sale	85,534	85,478
Total	130,689	129,707
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	28,696	30,642
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Corporate securities
Assets:
Investment securities available for sale	40,372	36,687
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| U.S. mortgage-backed securities
Assets:
Investment securities available for sale	5,089	6,500
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Commercial mortgage-backed securities
Assets:
Investment securities available for sale	433	1,398
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Commercial paper
Assets:
Investment securities available for sale	7,976	8,980
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Index-linked U.S. bonds
Assets:
Investment securities available for sale	2,314	770
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Foreign fixed-income securities
Assets:
Investment securities available for sale	654	501
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Fixed income securities
Assets:
Investment securities available for sale	85,534	85,478
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	42,662	41,247
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Certificates of deposit
Assets:
Cash and cash equivalents	2,493	2,982
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	86,190	112,332
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) \| Commercial paper
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Index-linked U.S. bonds
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Foreign fixed-income securities
Assets:
Investment securities available for sale	0	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	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	4,475	6,396
Nonrecurring nonfinancial assets subject to fair value measurements	4,475	6,396
Gain (loss) on long-term investments	(525)	(1,203)
Gain (loss) on long-term investments and real estate held for sale	(525)	(1,203)
Long-term investments	5,000	7,599
Impairment charge included in earnings	(525)	(1,203)
Fair Value, Measurements, Nonrecurring \| Significant Unobservable Inputs (Level 3)
Liabilities:
Long-term investments, fair value	4,475	6,396
Nonrecurring nonfinancial assets subject to fair value measurements	$ 4,475	$ 6,396

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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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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The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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