Debt - Term Loan - Narrative (Details)
|
Nov. 03, 2015
USD ($)
extension_option
|
Mar. 31, 2018
USD ($)
|
Dec. 31, 2017
USD ($)
|
| Debt Instrument [Line Items] |
|
|
|
| Amount outstanding |
|
$ 154,500,000
|
$ 112,000,000
|
| Unamortized deferred financing costs |
|
38,140,000
|
39,572,000
|
| Term Loan |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Number of one-year extension options | extension_option |
2
|
|
|
| Extension option, term |
1 year
|
|
|
| Accordion feature, maximum borrowing capacity |
$ 600,000,000
|
|
|
| Reborrow period after repayment |
30 days
|
|
|
| Period subject to occurrence limitation |
12 months
|
|
|
| Amount outstanding |
|
0
|
|
| Available borrowing capacity |
|
420,000,000
|
|
| Origination costs |
$ 2,400,000
|
|
|
| Unamortized deferred financing costs |
|
$ 500,000
|
$ 700,000
|
| Achievement of Two of Three Credit Ratings, S&P at least BBB-, Fitch at least BBB-, Moody's at least Baa3 | Minimum | Term Loan | LIBOR |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Basis spread on variable rate |
0.90%
|
|
|
| Achievement of Two of Three Credit Ratings, S&P at least BBB-, Fitch at least BBB-, Moody's at least Baa3 | Maximum | Term Loan | LIBOR |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Basis spread on variable rate |
1.75%
|
|
|