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Leases Lease information under previous guidance (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2018
Finance Leases      
2019 (full twelve months)     $ 119
2020     56
2021     2
2022     2
2023     1
Later years     0
Total future minimum rental payments under ASC 840     180
Operating Leases      
2019 (Full twelve months)     7,882
2020     7,398
2021     6,414
2022     5,702
2023     4,828
Later years     8,068
Total future minimum rental payments under ASC 840     40,292
Built-to-Suit Lease      
2019 (full twelve months)     915
2020     933
2021     952
2022     971
2023     990
Later years     7,461
Total future minimum rental payments under ASC 840     $ 12,222
Rental payments charged to expense $ 2,118 $ 6,258