Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net Income Attributable to Parent	$ 14,130	$ 9,613	$ 2,942	$ 1,053
Weighted average common shares outstanding, basic	39,584	39,358	39,509	39,287
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	718	523	631	561
Weighted average common shares outstanding, diluted	40,302	39,881	40,140	39,848
Basic (in dollars per share)	$ 0.36	$ 0.24	$ 0.07	$ 0.03
Diluted (in dollars per share)	$ 0.35	$ 0.24	$ 0.07	$ 0.03