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Leases Lease Costs and Other Information (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Lease, Cost [Abstract]        
Operating lease cost $ 3,532,000   $ 6,972,000  
Short-term lease cost 14,000   28,000  
Interest on lease liabilities 61,000   123,000  
Amortization of right-of-use asset (57,000)   (113,000)  
Sublease income (312,000)   (561,000)  
Net lease cost 3,352,000   6,675,000  
Rent expense related to leases   $ 3,100,000   $ 6,300,000
Operating cash flows related to operating leases 3,380,000   6,761,000  
Operating cash flows related to finance leases (61,000)   (123,000)  
Financing cash flows related to finance leases $ 57,000   $ 112,000