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Basis of Financial Reporting - Lease Costs, Cash Flows and Weighted Average Remaining Lease Term (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Lessee, Lease, Description [Line Items]    
Total operating rental expense $ 3,204 $ 9,414
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash outflows related to operating leases   7,307
Supplemental noncash activity:    
Operating ROU assets obtained in exchange for lease obligations, excluding impact of adoption   $ 7,972
Weighted average remaining lease term (years) 7 years 2 months 12 days 7 years 2 months 12 days
Weighted average discount rate 3.95% 3.95%
Rental expense, which is included in "other expenses" on the consolidated statement of income    
Lessee, Lease, Description [Line Items]    
Total operating rental expense $ 2,776 $ 8,276
Rental expense, which is included in "cost to provide communications services" on the consolidated statements of income    
Lessee, Lease, Description [Line Items]    
Total operating rental expense $ 428 $ 1,138