Debt - Term Loan - Narrative (Details)
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9 Months Ended |
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Nov. 03, 2015
USD ($)
extension_option
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Sep. 30, 2017
USD ($)
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Dec. 31, 2016
USD ($)
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Dec. 31, 2015
USD ($)
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| Debt Instrument [Line Items] |
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| Unamortized deferred financing costs |
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$ 31,013,000
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$ 37,111,000
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| Term Loan |
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| Debt Instrument [Line Items] |
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| Total debt, gross |
$ 325,000,000
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420,000,000
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$ 370,000,000
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| Number of one-year extension options | extension_option |
2
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| Extension option, term (in years) |
1 year
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| Accordion feature, maximum borrowing capacity |
$ 600,000,000
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| Days available to reborrow loans repaid |
30 days
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| Period subject to reborrowing occurrence limitations (in months) |
12 months
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| Origination costs |
$ 2,400,000
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| Unamortized deferred financing costs |
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$ 900,000
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$ 1,500,000
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| Term Loan | LIBOR |
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| Debt Instrument [Line Items] |
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| Basis spread on variable rate (as a percent) |
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1.35%
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| Minimum | Term Loan | LIBOR |
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| Debt Instrument [Line Items] |
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| Basis spread on variable rate (as a percent) |
1.35%
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| Minimum | Term Loan | Base Rate |
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| Debt Instrument [Line Items] |
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| Basis spread on variable rate (as a percent) |
0.35%
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| Maximum | Term Loan | LIBOR |
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| Debt Instrument [Line Items] |
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| Basis spread on variable rate (as a percent) |
1.80%
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| Maximum | Term Loan | Base Rate |
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| Debt Instrument [Line Items] |
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| Basis spread on variable rate (as a percent) |
0.80%
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| 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 |
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| Debt Instrument [Line Items] |
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| Basis spread on variable rate (as a percent) |
0.90%
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| Achievement of Two of Three Credit Ratings, S&P at least BBB-, Fitch at least BBB-, Moody's at least Baa3 | Minimum | Term Loan | Base Rate |
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| Debt Instrument [Line Items] |
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| Basis spread on variable rate (as a percent) |
0.00%
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| 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 |
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| Debt Instrument [Line Items] |
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| Basis spread on variable rate (as a percent) |
1.75%
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| Achievement of Two of Three Credit Ratings, S&P at least BBB-, Fitch at least BBB-, Moody's at least Baa3 | Maximum | Term Loan | Base Rate |
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| Debt Instrument [Line Items] |
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| Basis spread on variable rate (as a percent) |
0.75%
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