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Investments and Fair Value Measurements (Fair Value Measurements) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Mar. 24, 2014
Assets:
Investment securities available for sale	$ 156,903	$ 181,976
Liabilities:
Fair value of derivatives embedded within convertible debt	112,332	144,042
Long-term investments	53,197	62,726
Impairment of long-term investments	1,587	811	$ 0
Investments in real estate, net	23,640	23,318
Impairment of real estate, net	0	230	$ 0
5.5% Variable Interest Senior Convertible Debentures due 2020 \| Convertible Debt
Liabilities:
Fair value of derivatives embedded within convertible debt	$ 59,433	71,959
Interest rate	5.50%			5.50%
Equity securities
Assets:
Investment securities available for sale	$ 50,843	67,273
Mutual funds invested in fixed income securities
Assets:
Investment securities available for sale	20,582	20,111
Fair Value, Measurements, Recurring
Assets:
Investment securities available for sale	156,903	181,976
Total	453,924	292,127
Liabilities:
Fair value of derivatives embedded within convertible debt	112,332	144,042
Fair Value, Measurements, Recurring \| Equity securities
Assets:
Investment securities available for sale	50,843	67,273
Fair Value, Measurements, Recurring \| Mutual funds invested in fixed income securities
Assets:
Investment securities available for sale	20,582	20,111
Fair Value, Measurements, Recurring \| U.S. Government securities
Assets:
Investment securities available for sale	30,642	28,132
Fair Value, Measurements, Recurring \| Corporate securities
Assets:
Investment securities available for sale	36,687	41,561
Fair Value, Measurements, Recurring \| U.S. mortgage-backed securities
Assets:
Investment securities available for sale	6,500	5,790
Fair Value, Measurements, Recurring \| Commercial mortgage-backed securities
Assets:
Investment securities available for sale	1,398	8,728
Fair Value, Measurements, Recurring \| U.S. asset-backed securities
Assets:
Investment securities available for sale		8,276
Fair Value, Measurements, Recurring \| Commercial paper
Assets:
Investment securities available for sale	8,980
Fair Value, Measurements, Recurring \| Index-linked U.S. bonds
Assets:
Investment securities available for sale	770	2,105
Fair Value, Measurements, Recurring \| Foreign fixed-income securities
Assets:
Investment securities available for sale	501
Fair Value, Measurements, Recurring \| Fixed income securities
Assets:
Investment securities available for sale	85,478	94,592
Fair Value, Measurements, Recurring \| Money market funds
Assets:
Cash and cash equivalents	248,552	93,915
Fair Value, Measurements, Recurring \| Commercial paper
Assets:
Cash and cash equivalents	41,247
Fair Value, Measurements, Recurring \| Certificates of deposit
Assets:
Cash and cash equivalents	2,982	3,469
Fair Value, Measurements, Recurring \| Bonds
Assets:
Cash and cash equivalents	4,240	12,767
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investment securities available for sale	71,425	87,384
Total	324,217	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	50,843	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	20,582	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
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	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
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	248,552	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	4,240	12,767
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2)
Assets:
Investment securities available for sale	85,478	94,592
Total	129,707	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	30,642	28,132
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Corporate securities
Assets:
Investment securities available for sale	36,687	41,561
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| U.S. mortgage-backed securities
Assets:
Investment securities available for sale	6,500	5,790
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Commercial mortgage-backed securities
Assets:
Investment securities available for sale	1,398	8,728
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| U.S. asset-backed securities
Assets:
Investment securities available for sale		8,276
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Commercial paper
Assets:
Investment securities available for sale	8,980
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Index-linked U.S. bonds
Assets:
Investment securities available for sale	770	2,105
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Foreign fixed-income securities
Assets:
Investment securities available for sale	501
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Fixed income securities
Assets:
Investment securities available for sale	85,478	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	41,247
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Certificates of deposit
Assets:
Cash and cash equivalents	2,982	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	112,332	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
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	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Foreign fixed-income securities
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	6,396	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	(1,203)	(1,041)
Long-term investments	7,599	12,000
Impairment of long-term investments	1,203	811
Investments in real estate, net		4,010
Impairment of real estate, net		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	$ 6,396	$ 14,969