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Fair Value Measurements (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Level 1 [Member] |  |
Assets: |  |
Total | $ 0 | $ 0
Liabilities: |  |
Interest rate derivative financial instruments | 0 | 0
Total | 0 | 0
Level 2 [Member] |  |
Assets: |  |
Total | 7,562 | 32,587
Liabilities: |  |
Interest rate derivative financial instruments | 29,871 | 28,653
Total | 29,871 | 28,653
Total |  |
Assets: |  |
Total | 7,562 | 32,587
Liabilities: |  |
Interest rate derivative financial instruments | 29,871 | 28,653
Total | 29,871 | 28,653
Investments [Member] | Level 1 [Member] |  |
Assets: |  |
Investments, Fair Value Disclosure |  | 0
Investments [Member] | Level 2 [Member] |  |
Assets: |  |
Investments, Fair Value Disclosure | 7,450 | 12,283
Investments [Member] | Total |  |
Assets: |  |
Investments, Fair Value Disclosure | 7,450 | 12,283
Demand Obligation [Member] | Level 1 [Member] |  |
Assets: |  |
Investments, Fair Value Disclosure | 0 | 0
Demand Obligation [Member] | Level 2 [Member] |  |
Assets: |  |
Investments, Fair Value Disclosure | 112 | 20,304
Demand Obligation [Member] | Total |  |
Assets: |  |
Investments, Fair Value Disclosure | $ 112 | $ 20,304

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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