Acquisitions Dispositions - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	$ 141,874	$ 108,348	$ 102,342	$ 146,296	$ 104,567	$ 91,913	$ 92,682	$ 170,081	$ 498,860	$ 459,244	$ 498,834
Net Income (Loss) Attributable to Parent	$ 11,863	$ 4,416	$ 8,029	$ 20,367	$ 8,619	$ 5,119	$ 6,294	$ 21,109	$ 44,675	41,140	$ 36,092
BravePoint Group [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses, Net of Cash Divested										12,000
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal										6,700
DisposalGroupNotDiscontinuedOperationGainLossOnDisposalNetOfTax										4,000
Revenues										15,100
Net Income (Loss) Attributable to Parent										$ (232)