Investments and Fair Value Measurements (Details) - USD ($)	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Assets:
Investment securities available for sale	$ 181,976,000	$ 269,100,000
Liabilities:
Long-term investments	62,726,000	52,723,000
Real estate held for sale, net	$ 23,318,000	10,643,000
Nonrecurring fair value measurements		0
Convertible Debt [Member] \| 7.5% Variable Interest Senior Convertible Notes due 2019 [Member]
Liabilities:
Interest rate effective percentage	7.50%
Marketable equity securities
Assets:
Investment securities available for sale	$ 67,273,000	77,609,000
Mutual funds invested in fixed income securities
Assets:
Investment securities available for sale	20,111,000	59,826,000
U.S. Government securities
Assets:
Investment securities available for sale	28,132,000
Corporate securities
Assets:
Investment securities available for sale	41,561,000
U.S. mortgage-backed securities
Assets:
Investment securities available for sale	5,790,000
Commercial mortgage-backed securities
Assets:
Investment securities available for sale	8,728,000
U.S. asset backed securities
Assets:
Investment securities available for sale	8,276,000
Fixed Income Securities [Member]
Assets:
Investment securities available for sale	94,592,000
Fair Value, Measurements, Recurring [Member]
Assets:
Money market funds	93,915,000	205,180,000
Certificates of deposit	3,469,000	3,462,000
Bonds	12,767,000	4,868,000
Investment securities available for sale	181,976,000	269,100,000
Total	292,127,000	482,610,000
Liabilities:
Fair value of derivatives embedded within convertible debt	144,042,000	169,386,000
Fair Value, Measurements, Recurring [Member] \| Marketable equity securities
Assets:
Investment securities available for sale	67,273,000	77,609,000
Fair Value, Measurements, Recurring [Member] \| Mutual funds invested in fixed income securities
Assets:
Investment securities available for sale	20,111,000	59,826,000
Fair Value, Measurements, Recurring [Member] \| U.S. Government securities
Assets:
Investment securities available for sale	28,132,000	35,446,000
Fair Value, Measurements, Recurring [Member] \| Corporate securities
Assets:
Investment securities available for sale	41,561,000	55,888,000
Fair Value, Measurements, Recurring [Member] \| U.S. mortgage-backed securities
Assets:
Investment securities available for sale	5,790,000	4,770,000
Fair Value, Measurements, Recurring [Member] \| Commercial mortgage-backed securities
Assets:
Investment securities available for sale	8,728,000	16,508,000
Fair Value, Measurements, Recurring [Member] \| U.S. asset backed securities
Assets:
Investment securities available for sale	8,276,000	16,955,000
Fair Value, Measurements, Recurring [Member] \| Commodity Index Linked Notes [Member]
Assets:
Investment securities available for sale	2,105,000	2,098,000
Fair Value, Measurements, Recurring [Member] \| Fixed Income Securities [Member]
Assets:
Investment securities available for sale	94,592,000	131,665,000
Fair Value, Measurements, Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Money market funds	93,915,000	205,180,000
Certificates of deposit	0	0
Bonds	12,767,000	4,868,000
Investment securities available for sale	87,384,000	144,306,000
Total	194,066,000	354,354,000
Liabilities:
Fair value of derivatives embedded within convertible debt	0	0
Fair Value, Measurements, Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Marketable equity securities
Assets:
Investment securities available for sale	67,273,000	77,083,000
Fair Value, Measurements, Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Mutual funds invested in fixed income securities
Assets:
Investment securities available for sale	20,111,000	59,826,000
Fair Value, Measurements, Recurring [Member] \| 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 [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Corporate securities
Assets:
Investment securities available for sale	0	7,397,000
Fair Value, Measurements, Recurring [Member] \| 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 [Member] \| 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 [Member] \| 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 [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Commodity Index Linked Notes [Member]
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Fixed Income Securities [Member]
Assets:
Investment securities available for sale	0	7,397,000
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2)
Assets:
Money market funds	0	0
Certificates of deposit	3,469,000	3,462,000
Bonds	0	0
Investment securities available for sale	94,592,000	124,794,000
Total	98,061,000	128,256,000
Liabilities:
Fair value of derivatives embedded within convertible debt	0	0
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2) \| Marketable equity securities
Assets:
Investment securities available for sale	0	526,000
Fair Value, Measurements, Recurring [Member] \| 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 [Member] \| Significant Other Observable Inputs (Level 2) \| U.S. Government securities
Assets:
Investment securities available for sale	28,132,000	35,446,000
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2) \| Corporate securities
Assets:
Investment securities available for sale	41,561,000	48,491,000
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2) \| U.S. mortgage-backed securities
Assets:
Investment securities available for sale	5,790,000	4,770,000
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2) \| Commercial mortgage-backed securities
Assets:
Investment securities available for sale	8,728,000	16,508,000
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2) \| U.S. asset backed securities
Assets:
Investment securities available for sale	8,276,000	16,955,000
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2) \| Commodity Index Linked Notes [Member]
Assets:
Investment securities available for sale	2,105,000	2,098,000
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2) \| Fixed Income Securities [Member]
Assets:
Investment securities available for sale	94,592,000	124,268,000
Fair Value, Measurements, Recurring [Member] \| 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	144,042,000	169,386,000
Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs (Level 3) \| Marketable equity securities
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs (Level 3) \| Mutual funds invested in fixed income securities
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs (Level 3) \| U.S. Government securities
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs (Level 3) \| Corporate securities
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs (Level 3) \| U.S. mortgage-backed securities
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs (Level 3) \| Commercial mortgage-backed securities
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs (Level 3) \| U.S. asset backed securities
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs (Level 3) \| Commodity Index Linked Notes [Member]
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs (Level 3) \| Fixed Income Securities [Member]
Assets:
Investment securities available for sale	0	$ 0
Fair Value, Measurements, Nonrecurring [Member]
Liabilities:
Long-term investments	11,189,000
Gain (loss) on long-term investment	(811,000)
Long-term investments	12,000,000
Real estate held for sale, net	4,010,000
Gain (Loss) on Real Estate	(230,000)
Real estate held for sale	3,780,000
Impairment of long-term investments	811,000
Impairment of real estate	230,000
Nonrecurring fair value measurements	14,969,000
Nonrecurring fair value measurements gain (loss)	(1,041,000)
Fair Value, Measurements, Nonrecurring [Member] \| Significant Unobservable Inputs (Level 3)
Liabilities:
Long-term investments	11,189,000
Real estate held for sale	3,780,000
Nonrecurring fair value measurements	$ 14,969,000

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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