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Long-Term Debt | 9 Months Ended
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Sep. 30, 2018
Debt Disclosure [Abstract] |
Long-term debt | Long-term debt Our long-term debt is summarized below (in thousands):
| Sept. 30, 2018 |  | Dec. 31, 2017
Unsecured floating rate term loan due quarterly through August 2018 | $ | — |  |  | $ | 20,500 |
VIE unsecured floating rate term loans due quarterly through December 2018 | 162 |  |  | 646 |
Unsecured floating rate term loan due quarterly through June 2020 | 70,000 |  |  | 100,000 |
Unsecured floating rate term loan due quarterly through September 2020 | 180,000 |  |  | 225,000 |
Borrowings under revolving credit agreement expiring June 2023 | 72,000 |  |  | — |
Unsecured notes bearing fixed rate interest at 5.125% due October 2019 | 320,000 |  |  | 320,000 |
Unsecured notes bearing fixed rate interest at 5.125% due July 2020 | 600,000 |  |  | 600,000 |
Unsecured notes bearing fixed rate interest at 4.875% due September 2021 | 350,000 |  |  | 350,000 |
Unsecured notes bearing fixed rate interest at 6.375% due October 2023 | 650,000 |  |  | 650,000 |
Unsecured notes bearing fixed rate interest at 5.50% due September 2024 | 325,000 |  |  | 325,000 |
Unsecured notes bearing fixed rate interest at 7.75% due June 2027 | 200,000 |  |  | 200,000 |
Unsecured notes bearing fixed rate interest at 7.25% due September 2027 | 240,000 |  |  | 240,000 |
Total principal long-term debt | 3,007,162 |  |  | 3,031,146 |
Debt issuance costs | (16,766 | ) |  | (20,551 | )
Other (fair market value adjustments and discounts) | (799 | ) |  | (2,902 | )
Total long-term debt | 2,989,597 |  |  | 3,007,693 |
Less current portion of long-term debt maturities | 162 |  |  | 646 |
Long-term debt, net of current portion | $ | 2,989,435 |  |  | $ | 3,007,047 |
On June 21, 2018, we entered into an amendment of our Amended and Restated Competitive Advance and Revolving Credit Agreement. Under the amended terms, the $1.51 billion of revolving credit commitments and letter of credit commitments have been extended until June 21, 2023. The amendment also extended our permitted total leverage ratio to remain at 5.0 x through June 30, 2019, reducing to 4.75 x for the fiscal quarter ending September 30, 2019 through the end of the fiscal quarter ending June 30, 2020, and then reducing to 4.50 x for the fiscal quarter ending September 30, 2020 and thereafter. As of September 30, 2018, we had unused borrowing capacity of $1.42 billion under our revolving credit facility.

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- Definition The entire disclosure for long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 + Details
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