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Debt (Subordinated Debt Joint Venture Partners Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term Debt	$ 27,716,999	$ 29,641,863
Subordinated Debt Joint Ventures Partners [Member]
Debt Instrument [Line Items]
Stated interest rate	0.00%
Interest rate paid on unpaid interest	19.50%
Subordinated Debt Joint Ventures Partners Before Amendment [Member]
Debt Instrument [Line Items]
Stated interest rate	20.00%
Minimum [Member] | Subordinated Debt Joint Ventures Partners [Member]
Debt Instrument [Line Items]
Stated interest rate	15.00%
Subordinated Debt [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 1,555,548	1,564,045
Subordinated Debt [Member] | Subordinated Debt Joint Ventures Partners [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 55,780	$ 64,280

X

- Definition

Interest rate paid on unpaid interest.

+ References

No definition available.

+ Details

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ 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 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: 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(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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