Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 20,501	$ 22,361	$ 17,318	$ 19,056	$ 17,803	$ 13,378	$ 60,180	$ 50,237
Basic EPS, Shares	81,992			81,965			81,965	82,530
Basic EPS, Per Share Amount	$ 0.25			$ 0.23			$ 0.73	$ 0.61
Effect of restricted stock	$ 0			$ 0			$ 0	$ 0
Effect of restricted stock, Shares	48			27			43	34
Diluted EPS, Net Income	$ 20,501			$ 19,056			$ 60,180	$ 50,237
Diluted EPS, Shares	82,040			81,992			82,008	82,564
Diluted EPS, Per Share Amount	$ 0.25			$ 0.23			$ 0.73	$ 0.61
Retained Earnings [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 20,501	$ 22,361	$ 17,318	$ 19,056	$ 17,803	$ 13,378	$ 60,180