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Investments Available-for-sale Securities (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 6,629 us-gaap_AvailableForSaleSecuritiesAmortizedCost | $ 3,370 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax | 808 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax | (196)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax
Available-for-sale securities | 7,437 us-gaap_AvailableForSaleSecurities | 3,174 us-gaap_AvailableForSaleSecurities
Convertible debt securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 2,030 us-gaap_AvailableForSaleSecuritiesAmortizedCost / invest_InvestmentAxis = us-gaap_ConvertibleDebtSecuritiesMember | 3,370 us-gaap_AvailableForSaleSecuritiesAmortizedCost / invest_InvestmentAxis = us-gaap_ConvertibleDebtSecuritiesMember
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax | 497 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax / invest_InvestmentAxis = us-gaap_ConvertibleDebtSecuritiesMember | (196)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax / invest_InvestmentAxis = us-gaap_ConvertibleDebtSecuritiesMember
Available-for-sale securities | 2,527 us-gaap_AvailableForSaleSecurities / invest_InvestmentAxis = us-gaap_ConvertibleDebtSecuritiesMember | 3,174 us-gaap_AvailableForSaleSecurities / invest_InvestmentAxis = us-gaap_ConvertibleDebtSecuritiesMember
Redeemable preferred shares [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 4,599 us-gaap_AvailableForSaleSecuritiesAmortizedCost / invest_InvestmentAxis = us-gaap_RedeemablePreferredStockMember | 0 us-gaap_AvailableForSaleSecuritiesAmortizedCost / invest_InvestmentAxis = us-gaap_RedeemablePreferredStockMember
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax | 311 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax / invest_InvestmentAxis = us-gaap_RedeemablePreferredStockMember | 0 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax / invest_InvestmentAxis = us-gaap_RedeemablePreferredStockMember
Available-for-sale securities | $ 4,910 us-gaap_AvailableForSaleSecurities / invest_InvestmentAxis = us-gaap_RedeemablePreferredStockMember | $ 0 us-gaap_AvailableForSaleSecurities / invest_InvestmentAxis = us-gaap_RedeemablePreferredStockMember

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References No definition available. + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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