Borrowings (Schedule of Borrowings) (Details) - USD ($) $ in Thousands |
Mar. 31, 2018 |
Dec. 31, 2017 |
May 19, 2017 |
Oct. 03, 2016 |
|---|---|---|---|---|
| Principal components: | ||||
| Total principal outstanding | $ 675,000 | $ 625,000 | ||
| Premium on 6.125% senior unsecured notes due 2024, net of accumulated amortization | 7,312 | 7,594 | ||
| Unamortized deferred financing costs | (11,938) | (12,398) | ||
| Total carrying value of borrowings | 670,374 | 620,196 | ||
| Senior secured revolving credit facility | ||||
| Principal components: | ||||
| Total principal outstanding | 75,000 | 25,000 | ||
| 6.125% senior unsecured notes due 2024 | ||||
| Principal components: | ||||
| Total principal outstanding | $ 600,000 | $ 600,000 | ||
| Debt instrument, interest rate, stated (as a percent) | 6.125% | 6.125% | 6.125% |
| X | ||||||||||
- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount, after accumulated amortization, of debt discount (premium). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|