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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases
At December 31, 2016, the approximate minimum future commitments payable under non-cancelable contracts for leased premises are as follows:
(in thousands)
2017

2018

2019

2020

2021

Thereafter

Total

Operating leases1
$
3,850

$
3,919

$
3,725

$
3,405

$
2,114

$
4,069

$
21,082