Debt - Additional Information - Term Loan (Details)
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12 Months Ended |
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Nov. 03, 2015
USD ($)
extension_option
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Dec. 31, 2017
USD ($)
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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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| Number of extension options | extension_option |
2
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| Term of extension |
1 year
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| Term Loan |
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| Debt Instrument [Line Items] |
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| Term loan borrowing capacity amount |
$ 325,000,000
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$ 420,000,000
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$ 370,000,000
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| Period to re-borrow after repayment |
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30 days
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| Period subject to occurrence limitations |
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12 months
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| Deferred financing costs, gross |
$ 2,400,000
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| Unamortized deferred financing costs |
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$ 700,000
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$ 1,500,000
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| Line of credit facility remaining borrowing capacity |
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$ 420,000,000
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| Term Loan | Minimum | LIBOR |
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| Debt Instrument [Line Items] |
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| Basis spread on variable rate |
1.35%
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| Term Loan | Minimum | LIBOR | Achievement of Two of Three Credit Ratings, S&P at least BBB-, Fitch at least BBB-, Moody's at least Baa3 |
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| Debt Instrument [Line Items] |
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| Basis spread on variable rate |
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0.90%
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| Term Loan | Minimum | Base Rate |
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| Debt Instrument [Line Items] |
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| Basis spread on variable rate |
0.35%
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| Term Loan | Minimum | Base Rate | Achievement of Two of Three Credit Ratings, S&P at least BBB-, Fitch at least BBB-, Moody's at least Baa3 |
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| Debt Instrument [Line Items] |
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| Basis spread on variable rate |
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0.00%
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| Term Loan | Maximum |
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| Debt Instrument [Line Items] |
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| Term loan accordion feature |
$ 600,000,000.0
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| Term Loan | Maximum | LIBOR |
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| Debt Instrument [Line Items] |
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| Basis spread on variable rate |
1.80%
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| Term Loan | Maximum | LIBOR | Achievement of Two of Three Credit Ratings, S&P at least BBB-, Fitch at least BBB-, Moody's at least Baa3 |
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| Debt Instrument [Line Items] |
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| Basis spread on variable rate |
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1.75%
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| Term Loan | Maximum | Base Rate |
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| Debt Instrument [Line Items] |
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| Basis spread on variable rate |
0.80%
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| Term Loan | Maximum | Base Rate | Achievement of Two of Three Credit Ratings, S&P at least BBB-, Fitch at least BBB-, Moody's at least Baa3 |
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| Debt Instrument [Line Items] |
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| Basis spread on variable rate |
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0.75%
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