Earnings Per Common Share (EPS) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share, Basic and Diluted [Abstract]
Net income, basic EPS	$ 10,941	$ 9,483	$ 16,210	$ 24,286
Basic EPS (in shares)	50,473	49,957	50,376	47,406
Basic EPS (in dollars per share)	$ 0.22	$ 0.19	$ 0.32	$ 0.51
Effect of dilutive stock options and warrants (in shares)	1,681	1,231	1,657	1,110
Net income, diluted EPS	$ 10,941	$ 9,483	$ 16,210	$ 24,286
Diluted EPS (in shares)	52,154	51,188	52,033	48,516
Diluted EPS (in dollars per share)	$ 0.21	$ 0.19	$ 0.31	$ 0.50
Stock options excluded from the calculation of common stock equivalents as the impact was anti-dilutive (in shares)	535	1,007	359	552