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Debt (Details)
4 Months Ended 8 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Aug. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
asset
Dec. 31, 2016
USD ($)
Nov. 05, 2018
USD ($)
Mar. 09, 2018
USD ($)
Debt            
Debt Instrument, Fair Value Adjustment, Net     $ 32,800,000      
Number of Assets Encumbered | asset     4      
Long-term debt, gross $ 1,299,336,000   $ 626,628,000      
Deferred financing costs (231,000)   0      
Debt, net 1,299,105,000   626,628,000      
Related Party Debt     85,000,000      
Interest Expense 19,270,340   37,900,000      
Successor [Member]            
Debt            
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months     2,357,000      
Long-term Debt, Maturities, Repayments of Principal in Year Two     2,670,000      
Long-term Debt, Maturities, Repayments of Principal in Year Three     2,824,000      
Long-term Debt, Maturities, Repayments of Principal in Year Four     110,997,000      
Long-term Debt, Maturities, Repayments of Principal in Year Five     85,000,000      
Long-term debt, gross     678,848,000      
Long-term Debt, Maturities, Repayments of Principal after Year Five     $ 475,000,000      
Predecessor            
Debt            
Interest Expense   $ 51,700,000.0   $ 78,200,000    
Interest Costs Capitalized   $ 1,100,000   $ 1,000,000    
LIBOR Plus 3.00 Percent, Due November 2023 [Member]            
Debt            
Related Party Debt         $ 85,000,000  
Senior Secured Notes [Member]            
Debt            
Debt Instrument, Redemption Price, Percentage     102.813%      
Early Repayment of Senior Secured Notes           $ 12,900,000
Debt Instrument, Repurchase Amount     $ 539,000,000      
Senior Unsecured Notes [Member]            
Debt            
Debt Instrument, Redemption Price, Percentage     103.00%      
Unsecured Debt | 6.00% Percent, Due June 2025            
Debt            
Number of Assets Encumbered | asset     0      
Interest rate     6.00%      
Long-term debt, gross 510,047,000   $ 505,322,000      
Secured Debt | LIBOR Plus Three Point Zero Zero Percent Due November 2018 [Member]            
Debt            
Debt Instrument, Fair Value Adjustment, Net 400,000          
Secured Debt | Five Point Six Three Percent [Member]            
Debt            
Number of Assets Encumbered | asset     0      
Interest rate     5.625%      
Long-term debt, gross 552,669,000   $ 0      
Mortgage loans | LIBOR Plus Three Point Zero Zero Percent Due November 2018 [Member]            
Debt            
Number of Assets Encumbered | asset     0      
Long-term debt, gross 85,404,000   $ 0      
Mortgage loans | LIBOR Plus 3.00 Percent, Due November 2023 [Member] | LIBOR            
Debt            
Basis spread     3.00%      
Mortgage loans | 4.95 Percent, Due October 2022            
Debt            
Number of Assets Encumbered | asset     3      
Interest rate     4.95%      
Long-term debt, gross 120,893,000   $ 91,737,000      
Mortgage loans | 4.94 Percent, Due October 2022            
Debt            
Number of Assets Encumbered | asset     1      
Interest rate     4.94%      
Long-term debt, gross 30,323,000   $ 29,569,000      
Senior Unsecured Notes [Member] | Unsecured Debt            
Debt            
Debt Instrument, Fair Value Adjustment, Net 35,100,000   30,300,000.0      
Senior Secured Notes [Member] | Secured Debt            
Debt            
Debt Instrument, Fair Value Adjustment, Net 28,659,000          
4.94 Percent, Due October 2022 | Secured Debt            
Debt            
Debt Instrument, Fair Value Adjustment, Net 700,000   600,000      
4.95 Percent, Due October 2022 | Secured Debt            
Debt            
Debt Instrument, Fair Value Adjustment, Net $ 3,000,000   $ 1,900,000