Investments and Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term investments	$ 59,488	$ 62,726
Assets:
Investment securities available for sale	152,700	181,976
Liabilities:
Real estate held for sale, net	$ 23,366	23,318
5.5% Variable Interest Senior Convertible Notes due 2020 \| Convertible Debt [Member]
Liabilities:
Interest rate	5.50%
Equity securities
Assets:
Investment securities available for sale	$ 56,531	67,273
Mutual funds invested in fixed income securities
Assets:
Investment securities available for sale	20,292	20,111
U.S. Government securities
Assets:
Investment securities available for sale	22,730
Corporate securities
Assets:
Investment securities available for sale	35,592
U.S. mortgage-backed securities
Assets:
Investment securities available for sale	5,369
Commercial mortgage-backed securities
Assets:
Investment securities available for sale	5,605
U.S. asset backed securities
Assets:
Investment securities available for sale	4,443
Fixed income securities
Assets:
Investment securities available for sale	75,877
Fair Value, Measurements, Recurring
Assets:
Money market funds	88,888	93,915
Certificates of deposit	3,472	3,469
Bonds	15,802	12,767
Investment securities available for sale	152,700	181,976
Total	260,862	292,127
Liabilities:
Fair value of derivatives embedded within convertible debt	134,348	144,042
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Money market funds	88,888	93,915
Certificates of deposit	0	0
Bonds	15,802	12,767
Investment securities available for sale	76,823	87,384
Total	181,513	194,066
Liabilities:
Fair value of derivatives embedded within convertible debt	0	0
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2)
Assets:
Money market funds	0	0
Certificates of deposit	3,472	3,469
Bonds	0	0
Investment securities available for sale	75,877	94,592
Total	79,349	98,061
Liabilities:
Fair value of derivatives embedded within convertible debt	0	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3)
Assets:
Money market funds	0	0
Certificates of deposit	0	0
Bonds	0	0
Investment securities available for sale	0	0
Total	0	0
Liabilities:
Fair value of derivatives embedded within convertible debt	134,348	144,042
Fair Value, Measurements, Recurring \| Equity securities
Assets:
Investment securities available for sale	56,531	67,273
Fair Value, Measurements, Recurring \| Equity securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investment securities available for sale	56,531	67,273
Fair Value, Measurements, Recurring \| Equity securities \| Significant Other Observable Inputs (Level 2)
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| Equity securities \| Significant Unobservable Inputs (Level 3)
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| Mutual funds invested in fixed income securities
Assets:
Investment securities available for sale	20,292	20,111
Fair Value, Measurements, Recurring \| Mutual funds invested in fixed income securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investment securities available for sale	20,292	20,111
Fair Value, Measurements, Recurring \| Mutual funds invested in fixed income securities \| Significant Other Observable Inputs (Level 2)
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| Mutual funds invested in fixed income securities \| Significant Unobservable Inputs (Level 3)
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| U.S. Government securities
Assets:
Investment securities available for sale	22,730	28,132
Fair Value, Measurements, Recurring \| U.S. Government securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| U.S. Government securities \| Significant Other Observable Inputs (Level 2)
Assets:
Investment securities available for sale	22,730	28,132
Fair Value, Measurements, Recurring \| U.S. Government securities \| Significant Unobservable Inputs (Level 3)
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| Corporate securities
Assets:
Investment securities available for sale	35,592	41,561
Fair Value, Measurements, Recurring \| Corporate securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| Corporate securities \| Significant Other Observable Inputs (Level 2)
Assets:
Investment securities available for sale	35,592	41,561
Fair Value, Measurements, Recurring \| Corporate securities \| Significant Unobservable Inputs (Level 3)
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| U.S. mortgage-backed securities
Assets:
Investment securities available for sale	5,369	5,790
Fair Value, Measurements, Recurring \| U.S. mortgage-backed securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| U.S. mortgage-backed securities \| Significant Other Observable Inputs (Level 2)
Assets:
Investment securities available for sale	5,369	5,790
Fair Value, Measurements, Recurring \| U.S. mortgage-backed securities \| Significant Unobservable Inputs (Level 3)
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| Commercial mortgage-backed securities
Assets:
Investment securities available for sale	5,605	8,728
Fair Value, Measurements, Recurring \| Commercial mortgage-backed securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| Commercial mortgage-backed securities \| Significant Other Observable Inputs (Level 2)
Assets:
Investment securities available for sale	5,605	8,728
Fair Value, Measurements, Recurring \| Commercial mortgage-backed securities \| Significant Unobservable Inputs (Level 3)
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| U.S. asset backed securities
Assets:
Investment securities available for sale	4,443	8,276
Fair Value, Measurements, Recurring \| U.S. asset backed securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| U.S. asset backed securities \| Significant Other Observable Inputs (Level 2)
Assets:
Investment securities available for sale	4,443	8,276
Fair Value, Measurements, Recurring \| U.S. asset backed securities \| Significant Unobservable Inputs (Level 3)
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| Index-linked U.S. bonds
Assets:
Investment securities available for sale	2,138	2,105
Fair Value, Measurements, Recurring \| Index-linked U.S. bonds \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| Index-linked U.S. bonds \| Significant Other Observable Inputs (Level 2)
Assets:
Investment securities available for sale	2,138	2,105
Fair Value, Measurements, Recurring \| Index-linked U.S. bonds \| Significant Unobservable Inputs (Level 3)
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| Fixed income securities
Assets:
Investment securities available for sale	75,877	94,592
Fair Value, Measurements, Recurring \| Fixed income securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring \| Fixed income securities \| Significant Other Observable Inputs (Level 2)
Assets:
Investment securities available for sale	75,877	94,592
Fair Value, Measurements, Recurring \| Fixed income securities \| Significant Unobservable Inputs (Level 3)
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term investments	3,126	12,000
Liabilities:
Long-term investments, fair value	2,844	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	(282)	(811)
Gain (loss) on real estate		(230)
Other nonrecurring expense		(1,041)
Impairment charge	282	811
Real estate held for sale, net		4,010
Impairment of real estate		230
Fair Value, Measurements, Nonrecurring [Member] \| Significant Unobservable Inputs (Level 3)
Liabilities:
Long-term investments, fair value	$ 2,844	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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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Amount of other expense that is infrequent in occurrence or unusual in nature.

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