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Operating Leases Operating Leases (Tables) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Operating Leased Assets [Line Items]          
Operating Lease, Right-of-Use Asset   $ 155,700,000 $ 0   $ 194,100,000
Impairment of Leasehold $ 1,883 1,883,000 0 $ 0  
Future Minimum Sublease Rentals, Sale Leaseback Transactions, Next Twelve Months   46,035,000      
Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Two Years   39,586,000      
Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Three Years   30,474,000      
Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Four Years   21,680,000      
Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Five Years   18,020,000      
Future Minimum Sublease Rentals, Sale Leaseback Transactions, Thereafter   38,119,000      
Lessee, Operating Lease, Liability, Payments, Due   193,914,000      
Lessee, Operating Lease, Liability, Undiscounted Excess Amount   22,118,000      
Future Minimum Sublease Rentals, Sale Leaseback Transactions   171,796,000      
Operating Lease, Liability, Current   38,624,000 0    
Operating Lease, Liability, Noncurrent   133,172,000 $ 0    
Lease Liability   $ 171,796,000     $ 209,000,000
Operating Lease, Weighted Average Remaining Lease Term   5 years 6 months      
Operating Lease, Weighted Average Discount Rate, Percent   4.40%