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Long-Term Debt - Summary of Interest Received and Paid under Term of Cash Flow Swap (Details) | Sep. 30, 2018 USD ($)
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Derivatives, Fair Value [Line Items] |
One month LIBOR rate | 2.261%
Cash Flow Swap A |
Derivatives, Fair Value [Line Items] |
Notional Amount | $ 250,000,000.0
Pay Rate | 2.00%
Cash Flow Swap B |
Derivatives, Fair Value [Line Items] |
Notional Amount | $ 375,000,000.0
Pay Rate | 2.00%
Cash Flow Swap C |
Derivatives, Fair Value [Line Items] |
Notional Amount | $ 375,000,000.0
Pay Rate | 3.00%
Cash Flow Swap D |
Derivatives, Fair Value [Line Items] |
Notional Amount | $ 312,500,000
Pay Rate | 2.00%
Cash Flow Swap E |
Derivatives, Fair Value [Line Items] |
Notional Amount | $ 250,000,000.0
Pay Rate | 3.00%
Cash Flow Swap F |
Derivatives, Fair Value [Line Items] |
Notional Amount | $ 225,000,000.0
Pay Rate | 3.00%
Cash Flow Swap G |
Derivatives, Fair Value [Line Items] |
Notional Amount | $ 150,000,000.0
Pay Rate | 2.00%
Cash Flow Swap H |
Derivatives, Fair Value [Line Items] |
Notional Amount | $ 250,000,000.0
Pay Rate | 3.00%

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