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Investments Available-for-sale Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | $ 2,800 |
Available-for-sale Securities, Amortized Cost Basis |  | 28,384 | $ 26,828
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 1,333 | 1,691
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | (2,933) | (1,037)
Available-for-sale securities |  | 26,784 | 27,482
Convertible debt securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis |  | 10,009 | 8,453
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 1,333 | 1,691
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | (110) | (106)
Available-for-sale securities |  | 11,232 | 10,038
Redeemable preferred shares [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis |  | 18,375 | 18,375
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0 | 0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | [1] | (2,823) | (931)
Available-for-sale securities |  | $ 15,552 | $ 17,444
Minimum [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Equity Method Investment, Ownership Percentage |  | 10.00% | 41.00%
AFS Debt Security, Ownership Percentage |  | 19.00% | 19.00%
Maximum [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Equity Method Investment, Ownership Percentage |  | 24.00% |
AFS Debt Security, Ownership Percentage |  | 25.00% | 25.00%
[1] | (1)As of September 30, 2017, one security in an unrealized loss position of $2.8 million has been in an unrealized loss position for greater than 12 months.

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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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=75030427&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=82897076&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=82896770&loc=d3e26610-111562 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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