Annual report pursuant to Section 13 and 15(d)

Commitments, Contingencies and Other Liabilities - Narrative (Details)

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Commitments, Contingencies and Other Liabilities - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]          
Rent expense   $ 3,798 $ 3,768 $ 3,383  
Legal reserve         $ 28,000
Settlement amount unpaid $ 5,000