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Commitments and Contingencies Lease Contractual obligation (Details) |  | 3 Months Ended |
--- | --- | --- | ---
Mar. 01, 2019 USD ($) ft² | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Leases [Abstract] |  |  |
Operating Lease Term | 5 years |  |
Finance lease right-of-use assets |  | $ 22,700,000 |
Finance Lease, Right-of-Use Asset, Amortization |  | 1,500,000 |
Operating Leases, Future Minimum Payments Due, Next Twelve Months |  | 41,500,000 | $ 47,400,000
Capital Leases, Future Minimum Payments Due, Next Twelve Months |  | 5,500,000 | 6,600,000
Operating Leases, Future Minimum Payments, Due in Two Years |  | 48,400,000 | 38,400,000
Capital Leases, Future Minimum Payments Due in Two Years |  | 6,300,000 | 5,400,000
Operating Leases, Future Minimum Payments, Due in Three Years |  | 35,700,000 | 27,200,000
Capital Leases, Future Minimum Payments Due in Three Years |  | 4,500,000 | 3,800,000
Operating Leases, Future Minimum Payments, Due in Four Years |  | 24,500,000 | 17,900,000
Capital Leases, Future Minimum Payments Due in Four Years |  | 2,700,000 | 2,100,000
Operating Leases, Future Minimum Payments, Due in Five Years |  | 18,700,000 | 12,700,000
Capital Leases, Future Minimum Payments Due in Five Years |  | 1,300,000 | 900,000
Operating Leases, Future Minimum Payments, Due Thereafter |  | 18,600,000 | 16,100,000
Capital Leases, Future Minimum Payments Due Thereafter |  | 12,900,000 | 12,800,000
Operating Leases, Future Minimum Payments Due |  | 187,400,000 | 159,700,000
Capital Leases, Future Minimum Payments Due |  | 33,200,000 | 31,600,000
Lessee, Operating Lease, Liability, Undiscounted Excess Amount |  | (16,700,000) |
Finance Lease, Liability, Undiscounted Excess Amount |  | 4,600,000 |
Capital Leases, Future Minimum Payments, Interest Included in Payments |  |  | 2,100,000
Operating Lease, Liability |  | 170,700,000 |
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments |  | 28,600,000 | 29,500,000
Finance Lease, Interest Expense |  | 200,000 |
Operating Lease, Cost |  | 14,800,000 |
Short-term Lease, Cost |  | 1,100,000 |
Variable Lease, Cost |  | 4,500,000 |
Lease, Cost |  | 22,100,000 |
Operating lease right-of-use assets |  | 170,100,000 | 0
Finance lease liability, current |  | 6,300,000 |
Finance lease liability, non-current |  | 22,300,000 |
Operating lease liability, current |  | 48,100,000 | 0
Operating lease liability, non-current |  | $ 122,600,000 | $ 0
Weighted-average remaining lease term - finance leases |  | 5 years 5 months 15 days |
Weighted-average remaining lease term - operating leases |  | 4 years 4 months 13 days |
Weighted-average discount rate - finance leases |  | 2.23% |
Weighted-average discount rate – operating leases |  | 4.05% |
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 finance leases |  | $ 1,000,000.0 |
Operating cash flows from operating leases |  | 12,700,000 |
Financing cash flows from finance leases |  | 1,600,000 |
Right-of-use assets obtained in exchange for new finance lease liabilities |  | 3,200,000 |
Right-of-use assets obtained in exchange for new operating lease liabilities |  | $ 16,600,000 |

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