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Unearned Revenue - Changes in Unearned Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Unearned Revenue    
Balance, beginning of period $ 118,211 $ 105,837
Billings, excluding billings for customer arrangements with termination rights 40,791 40,323
Additions to unearned revenue upon expiration of termination rights (4,645) (5,000)
Recognition of revenue (49,609) (48,281)
Balance, end of period 114,038 102,879
Increase (decrease) in total unbilled accounts receivable 89 (199)
Revenue Reported in Consolidated Statement of Operations $ 49,698 $ 48,082