CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($)	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings/(Accumulated Deficit) [Member]	Accumulated Other Comprehensive Income/(Loss) [Member]	Total
Balance at Dec. 31, 2016	$ 55,419,000	$ (866,000)	$ 360,564,000	$ (111,941,000)	$ (4,213,000)	$ 298,963,000
Balance, shares at Dec. 31, 2016	55,419,204
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				21,673,000		21,673,000
Common stock issuance costs			(200,000)			$ (200,000)
Common stock issued from option exercises, net of tax benefits, shares						468,431
Common stock issued from restricted units, net of tax benefits	$ 442,000		(413,000)	(29,000)
Common stock issued from restricted units, net of tax benefits, shares	441,946
Reclassification due to the adoption of ASU No. 2018-02				812,000	(812,000)
Stock-based compensation			3,245,000			$ 3,245,000
Other comprehensive loss (income), net of reclassification adjustments and tax					468,000	468,000
Balance at Dec. 31, 2017	$ 55,861,000	(866,000)	363,196,000	(89,485,000)	(4,557,000)	324,149,000
Balance (in shares) at Dec. 31, 2017	55,861,150
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				88,677,000		88,677,000
Common stock issued from option exercises, net of tax benefits	$ 13,000		107,000	(9,000)		$ 111,000
Common stock issued from option exercises, net of tax benefits, shares	13,390					594,673
Common stock issued from restricted units, net of tax benefits	$ 572,000		(572,000)
Common stock issued from restricted units, net of tax benefits, shares	571,548
Stock-based compensation			3,450,000			$ 3,450,000
Other comprehensive loss (income), net of reclassification adjustments and tax					(9,611,000)	(9,611,000)
Balance at Dec. 31, 2018	$ 56,446,000	(866,000)	366,181,000	(817,000)	(14,168,000)	$ 406,776,000
Balance (in shares) at Dec. 31, 2018	56,446,088					56,446,088
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				51,559,000		$ 51,559,000
Common stock issued from option exercises, net of tax benefits	$ 30,000		228,000			$ 258,000
Common stock issued from option exercises, net of tax benefits, shares	30,000					494,430
Common stock issued from restricted units, net of tax benefits	$ 465,000		(465,000)
Common stock issued from restricted units, net of tax benefits, shares	464,433
Stock-based compensation			5,689,000			$ 5,689,000
Other comprehensive loss (income), net of reclassification adjustments and tax					20,215,000	20,215,000
Balance at Dec. 31, 2019	$ 56,941,000	$ (866,000)	$ 371,633,000	$ 50,742,000	$ 6,047,000	$ 484,497,000
Balance (in shares) at Dec. 31, 2019	56,940,521					56,940,521