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Commitments and Contingencies Lease Contractual obligation (Details) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Mar. 01, 2019 USD ($) ft² | Jun. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Leases [Abstract] |  |  |  |
Operating Lease Term | 5 years |  |  |
Finance lease right-of-use assets |  | $ 23,900,000 | $ 23,900,000 |
Finance Lease, Right-of-Use Asset, Amortization |  | 1,800,000 | 3,300,000 |
Operating Leases, Future Minimum Payments Due, Next Twelve Months |  | 28,500,000 | 28,500,000 | $ 47,400,000
Capital Leases, Future Minimum Payments Due, Next Twelve Months |  | 3,700,000 | 3,700,000 | 6,600,000
Operating Leases, Future Minimum Payments, Due in Two Years |  | 50,900,000 | 50,900,000 | 38,400,000
Capital Leases, Future Minimum Payments Due in Two Years |  | 6,500,000 | 6,500,000 | 5,400,000
Operating Leases, Future Minimum Payments, Due in Three Years |  | 37,800,000 | 37,800,000 | 27,200,000
Capital Leases, Future Minimum Payments Due in Three Years |  | 4,900,000 | 4,900,000 | 3,800,000
Operating Leases, Future Minimum Payments, Due in Four Years |  | 25,800,000 | 25,800,000 | 17,900,000
Capital Leases, Future Minimum Payments Due in Four Years |  | 3,100,000 | 3,100,000 | 2,100,000
Operating Leases, Future Minimum Payments, Due in Five Years |  | 19,700,000 | 19,700,000 | 12,700,000
Capital Leases, Future Minimum Payments Due in Five Years |  | 1,200,000 | 1,200,000 | 900,000
Operating Leases, Future Minimum Payments, Due Thereafter |  | 19,200,000 | 19,200,000 | 16,100,000
Capital Leases, Future Minimum Payments Due Thereafter |  | 11,700,000 | 11,700,000 | 12,800,000
Operating Leases, Future Minimum Payments Due |  | 181,900,000 | 181,900,000 | 159,700,000
Capital Leases, Future Minimum Payments Due |  | 31,100,000 | 31,100,000 | 31,600,000
Lessee, Operating Lease, Liability, Undiscounted Excess Amount |  | (14,700,000) | (14,700,000) |
Finance Lease, Liability, Undiscounted Excess Amount |  | 1,100,000 | 1,100,000 |
Capital Leases, Future Minimum Payments, Interest Included in Payments |  |  |  | (2,100,000)
Operating Lease, Liability |  | 167,200,000 | 167,200,000 |
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments |  | 30,000,000.0 | 30,000,000.0 | 29,500,000
Finance Lease, Interest Expense |  | 200,000 | 300,000 |
Operating Lease, Cost |  | 14,900,000 | 29,300,000 |
Short-term Lease, Cost |  | 1,200,000 | 2,300,000 |
Variable Lease, Cost |  | 5,200,000 | 10,100,000 |
Lease, Cost |  | 23,300,000 | 45,300,000 |
Operating lease right-of-use assets |  | 166,200,000 | 166,200,000 | 0
Finance lease liability, current |  | 6,600,000 | 6,600,000 |
Finance lease liability, non-current |  | 23,400,000 | 23,400,000 |
Operating lease liability, current |  | 49,600,000 | 49,600,000 | 0
Operating lease liability, non-current |  | $ 117,600,000 | $ 117,600,000 | $ 0
Weighted-average remaining lease term - finance leases |  | 5 years 3 months 21 days | 5 years 3 months 21 days |
Weighted-average remaining lease term - operating leases |  | 4 years 3 months | 4 years 3 months |
Weighted-average discount rate - finance leases |  | 2.18% | 2.18% |
Weighted-average discount rate – operating leases |  | 3.97% | 3.97% |
Area of Leased Office Building | ft² | 192,000 |  |  |
Purchase Price of Property at End of Lease Term | $ 41,200,000 |  |  |
Percentage of Lease Balance as Final Payment End of Lease Term | 87.00% |  |  |
debt instrument, Covenant for debt not paid | $ 75,000,000 |  |  |
Operating cash flows from operating leases |  | $ 14,700,000 | $ 27,400,000 |
Financing cash flows from finance leases |  | 2,300,000 | 3,800,000 |
Right-of-use assets obtained in exchange for new finance lease liabilities |  | 2,800,000 | 6,000,000.0 |
Right-of-use assets obtained in exchange for new operating lease liabilities |  | $ 5,000,000.0 | $ 21,600,000 |

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