Earnings Per Common Share (EPS) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share, Basic and Diluted [Abstract]
Net income, basic									$ 42,017	$ 27,523	$ 20,121
Basic (in shares)									52,268	48,805	44,408
Basic (in dollars per share)	$ 0.17	$ 0.31	$ 0.22	$ 0.10	$ 0.14	$ (0.07)	$ 0.19	$ 0.33	$ 0.80	$ 0.56	$ 0.45
Effect of dilutive stock options and warrants (in shares)									1,663	1,296	454
Net income, diluted									$ 42,017	$ 27,523	$ 20,121
Diluted (in shares)									53,931	50,101	44,862
Diluted (in dollars per share)	$ 0.16	$ 0.30	$ 0.21	$ 0.10	$ 0.13	$ (0.07)	$ 0.19	$ 0.32	$ 0.78	$ 0.55	$ 0.45
Antidilutive securities excluded from EPS (in shares)									396	381	727