Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Summary of Interest Received and Paid under Term of Cash Flow Swap (Details)

v3.8.0.1
Long-Term Debt - Summary of Interest Received and Paid under Term of Cash Flow Swap (Details)
Mar. 31, 2018
USD ($)
Derivatives, Fair Value [Line Items]  
One month LIBOR rate 1.883%
Cash Flow Swap A  
Derivatives, Fair Value [Line Items]  
Notional Amount $ 250,000,000
Pay Rate 2.00%
Cash Flow Swap B  
Derivatives, Fair Value [Line Items]  
Notional Amount $ 375,000,000
Pay Rate 2.00%
Cash Flow Swap C  
Derivatives, Fair Value [Line Items]  
Notional Amount $ 375,000,000
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
Pay Rate 3.00%
Cash Flow Swap F  
Derivatives, Fair Value [Line Items]  
Notional Amount $ 225,000,000
Pay Rate 3.00%
Cash Flow Swap G  
Derivatives, Fair Value [Line Items]  
Notional Amount $ 150,000,000
Pay Rate 2.00%
Cash Flow Swap H  
Derivatives, Fair Value [Line Items]  
Notional Amount $ 250,000,000
Pay Rate 3.00%