Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Leases) (Details)

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Commitments and Contingencies (Leases) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Future annual minimum lease commitments under operating leases  
2018 $ 14,104
2019 14,721
2020 14,572
2021 13,986
2022 10,349
Thereafter 43,406
Total $ 111,138