Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 22,361	$ 17,318	$ 17,803	$ 13,378	$ 39,679	$ 31,182
Basic EPS, Shares	81,968		82,330		81,952	82,817
Basic EPS, Per Share Amount	$ 0.27		$ 0.22		$ 0.48	$ 0.38
Effect of restricted stock	$ 0		$ 0		$ 0	$ 0
Effect of restricted stock, Shares	59		38		39	38
Diluted EPS, Net Income	$ 22,361		$ 17,803		$ 39,679	$ 31,182
Diluted EPS, Shares	82,027		82,368		81,991	82,855
Diluted EPS, Per Share Amount	$ 0.27		$ 0.22		$ 0.48	$ 0.38
Retained Earnings [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 22,361	$ 17,318	$ 17,803	$ 13,378	$ 39,679