Acquisition (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Aug. 01, 2015
Acquisition [Abstract]
Cash			$ 10
Deferred tax assets			653
Goodwill	$ 64,059	$ 64,059	5,945
Identifiable intangible assets			7,515
Other assets			202
Total assets acquired			14,325
Contingent consideration liability			2,904
Deferred tax liabilities			2,803
Other liabilities			1,507
Total liabilities assumed			7,214
Net assets acquired			$ 7,111