Annual report pursuant to Section 13 and 15(d)

Operating Leases - (Details Textual)

v3.7.0.1
Operating Leases - (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Leases, Operating [Abstract]      
Total rent expense under operating leases $ 22,487 $ 19,814 $ 17,498