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Debt (Details) - USD ($) $ in Thousands |  | 9 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2019 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Aug. 02, 2019 | Aug. 01, 2019 | Jul. 08, 2019 | May 16, 2019 | Feb. 08, 2019 | Feb. 07, 2019
Debt |  |  |  |  |  |  |  |  |  |  |
Debt and Lease Obligation |  |  | $ 6,684,162 | $ 7,595,922 |  |  |  |  |  |  |
Debt, Unamortized Deferred Financing Costs |  |  | (39,781) | (44,889) |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount (Premium), Net |  |  | (8,791) | (16,308) |  |  |  |  |  |  |
Adjustment to Purchase Price of Debt |  |  | (4,065) | (5,293) |  |  |  |  |  |  |
Debt and Capital Lease Obligations, net of deferred financing costs |  |  | 6,631,525 | 7,529,432 |  |  |  |  |  |  |
Debt Instrument, Fair Value Disclosure |  |  | 6,747,800 | 7,559,100 |  |  |  |  |  |  |
Write-off of debt costs |  |  | 2,543 | 6,090 | $ 6,973 |  |  |  |  |  |
Payments To Capital Lease Obligations |  |  | 41,200 |  |  |  |  |  |  |  |
Proceeds from the sale of building |  |  | 0 | 27,630 | 0 |  |  |  |  |  |
Net gain on sale of building |  |  | 0 | 20,953 | $ 0 |  |  |  |  |  |
Borrowing capacity |  |  |  |  |  |  |  | $ 325,000 |  |  |
Less: amount representing interest |  |  | (3,695) |  |  |  |  |  |  |  |
Capital lease obligations |  |  | 27,024 |  |  |  |  |  |  |  |
Debt maturities (excluding capital lease obligations) |  |  |  |  |  |  |  |  |  |  |
2019 |  |  | 822,537 |  |  |  |  |  |  |  |
2020 |  |  | 827,125 |  |  |  |  |  |  |  |
2021 |  |  | 1,048,929 |  |  |  |  |  |  |  |
2022 |  |  | 1,638,092 |  |  |  |  |  |  |  |
2023 |  |  | 1,052,157 |  |  |  |  |  |  |  |
2025 and thereafter |  |  | 1,268,298 |  |  |  |  |  |  |  |
Total |  |  | 6,657,138 |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 1.75% |  |  |
Future lease payments under these capital leases |  |  |  |  |  |  |  |  |  |  |
2019 |  |  | 4,370 |  |  |  |  |  |  |  |
2020 |  |  | 4,370 |  |  |  |  |  |  |  |
2021 |  |  | 4,370 |  |  |  |  |  |  |  |
2022 |  |  | 4,370 |  |  |  |  |  |  |  |
2023 |  |  | 13,239 |  |  |  |  |  |  |  |
2023 and thereafter |  |  | 0 |  |  |  |  |  |  |  |
Total future payments |  |  | $ 30,719 |  |  |  |  |  |  |  |
Interest Rate Swap [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Net Notional Amount of Interest Rate During Period |  |  | 2.02% |  |  |  |  |  |  |  |
Interest Rate Swaps Average Remaining Maturity |  |  | 5 years 1 month 6 days |  |  |  |  |  |  |  |
Revolving Credit Facility and Second Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Future lease payments under these capital leases |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  | $ 845,900 |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | $ 1,125,000 |  |
Second Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity |  |  |  |  |  | $ 500,000 | $ 39,200 |  |  | $ 800,000 | $ 300,000
Term Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt and Lease Obligation |  |  | $ 1,200,375 | 1,543,375 |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 3.32% |  |  |  |  |  |  |  |
Repayments of Debt | $ 210,300 |  |  |  |  |  |  |  |  |  |
Institutional Notes [Domain] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt and Lease Obligation |  |  | $ 1,957,557 | 2,198,200 |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 4.65% |  |  |  |  |  |  |  |
Asset-backed securitization term notes |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt and Lease Obligation |  |  | $ 2,719,206 | 3,063,821 |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 3.69% |  |  |  |  |  |  |  |
Asset-backed securitization warehouse |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt and Lease Obligation |  |  | $ 370,000 | 340,000 |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 3.51% |  |  |  |  |  |  |  |
Revolving credit facilities |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt and Lease Obligation |  |  | $ 410,000 | 375,000 |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 3.45% |  |  |  |  |  |  |  |
Borrowing capacity |  |  | $ 1,560,000 |  |  |  |  |  |  |  |
Capital lease obligations |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt and Lease Obligation |  |  | $ 27,024 | $ 75,526 |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 4.92% |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Capital Lease Period Over Which Interest Expense Recognized Preceding Early Purchase Option |  | 3 years |  |  |  |  |  |  |  |  |
Minimum [Member] | Institutional Notes [Domain] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  | 7 years |  |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Capital Lease Period Over Which Interest Expense Recognized Preceding Early Purchase Option |  | 10 years |  |  |  |  |  |  |  |  |
Maximum [Member] | Institutional Notes [Domain] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  | 12 years |  |  |  |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  |  | 1.50% |  |
London Interbank Offered Rate (LIBOR) [Member] | Second Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  | 1.65% |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.75% |  |  |  |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Term Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.85% |  |  |  |  |  |  |  |  |
Excluding Impact [Member] | Fixed Rate Debt [Member] |  |  |  |  |  |  |  |  |  |  |
Debt maturities (excluding capital lease obligations) |  |  |  |  |  |  |  |  |  |  |
Debt, Percentage Interest Rate Remaining Term |  |  | 3 years 4 months 24 days |  |  |  |  |  |  |  |
Excluding Impact [Member] | Variable Rate Debt [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  | $ 2,699,846 |  |  |  |  |  |  |  |
Debt maturities (excluding capital lease obligations) |  |  |  |  |  |  |  |  |  |  |
Debt, Percentage Interest Rate Remaining Term |  |  | 3 years 7 months 6 days |  |  |  |  |  |  |  |
Including Impact [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  | $ 6,684,162 |  |  |  |  |  |  |  |
Debt maturities (excluding capital lease obligations) |  |  |  |  |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  |  | 3.95% |  |  |  |  |  |  |  |
Including Impact [Member] | Fixed Rate Debt [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  | $ 3,984,316 |  |  |  |  |  |  |  |
Debt maturities (excluding capital lease obligations) |  |  |  |  |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  |  | 4.23% |  |  |  |  |  |  |  |
Including Impact [Member] | Variable Rate Debt [Member] |  |  |  |  |  |  |  |  |  |  |
Debt maturities (excluding capital lease obligations) |  |  |  |  |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  |  | 3.38% |  |  |  |  |  |  |  |
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |  |  |  |  |
Debt maturities (excluding capital lease obligations) |  |  |  |  |  |  |  |  |  |  |
Net Notional Amount of Interest Rate Agreements |  |  | $ 1,799,204 |  |  |  |  |  |  |  |
Designated as Hedging Instrument [Member] | Including Impact [Member] | Fixed and Hedged Debt [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  | $ 5,783,520 |  |  |  |  |  |  |  |
Debt maturities (excluding capital lease obligations) |  |  |  |  |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  |  | 4.04% |  |  |  |  |  |  |  |
Designated as Hedging Instrument [Member] | Including Impact [Member] | Hedged Debt [Member] |  |  |  |  |  |  |  |  |  |  |
Debt maturities (excluding capital lease obligations) |  |  |  |  |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  |  | 3.60% |  |  |  |  |  |  |  |
Not Designated as Hedging Instrument [Member] | Including Impact [Member] | Unhedged Debt [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  | $ 900,642 |  |  |  |  |  |  |  |

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