Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	20,116	18	9,375	3,694
Net Income	$ 26,563	$ 219	$ 80,394	$ 36,148
Weighted average number of common shares outstanding (for basic calculation)	20,666,000	20,474,000	20,607,000	20,362,000
Dilutive securities	821,000	1,159,000	949,000	1,226,000
Diluted (in shares)	21,487,000	21,633,000	21,556,000	21,588,000
EPS - basic	$ 1.29	$ 0.01	$ 3.90	$ 1.78
Diluted (In dollars per share)	$ 1.24	$ 0.01	$ 3.73	$ 1.67