Acquisitions Pro Forma (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenues	$ 357,569	$ 280,230	$ 208,080
Business Acquisition, Pro Forma Revenue	358,696
Business Acquisition, Pro Forma Net Income (Loss)	$ 27,435
Business Acquisition, Pro Forma Earnings Per Share, Diluted	$ 1,280
Net Income (Loss) Attributable to Parent	$ 27,358	$ 41,013	$ 20,342
Earnings Per Share, Diluted	$ 1.28	$ 2.05	$ 1.26
Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenues	$ 1,127
Net Income (Loss) Attributable to Parent	$ 77
Earnings Per Share, Diluted	$ 0