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Stock-Based Compensation Plans (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) Plan $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares
Stock-Based Compensation Plans [Abstract]
Number of employee compensation plans | Plan	2
Additional Disclosures [Abstract]
Tax expense recognized | $	$ 293	$ 98	$ 143
Compensation cost related to unvested equity awards | $	$ 6,165
Weighted-average period for recognition of cost	2 years
Selling, General and Administrative Expense [Member]
Additional Disclosures [Abstract]
Stock-based compensation expense | $	$ 4,375	$ 3,435	$ 4,358
2014 LTIP Plan [Member]
Stock-Based Compensation Plans [Abstract]
Shares available for grant (in shares)	307,000
Service-Based Restricted Stock Awards [Member]
Equity Award Activity [Roll Forward]
Outstanding, beginning balance (in shares)	234,810	249,142	254,490
Granted (in shares)	145,375	137,768	141,722
Awards vested or rights exercised (in shares)	(130,434)	(133,364)	(132,872)
Forfeited (in shares)	(10,470)	(18,736)	(14,198)
Outstanding, ending balance (in shares)	239,281	234,810	249,142
Expected to vest (in shares)	239,281
Weighted-Average Award Price [Roll Forward]
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 20.93	$ 22.05	$ 21.88
Granted (in dollars per share) | $ / shares	20.42	20.24	22.73
Awards vested or rights exercised (in dollars per share) | $ / shares	20.69	22.27	22.45
Forfeited (in dollars per share) | $ / shares	20.41	21.25	21.94
Outstanding, ending balance (in dollars per share) | $ / shares	20.77	$ 20.93	$ 22.05
Expected to vest (in dollars per share) | $ / shares	$ 20.77
Additional Disclosures [Abstract]
Fair value of vested shares | $	$ 1,798	$ 2,491	$ 2,594
Aggregate intrinsic value of outstanding awards | $	$ 6,621
Service-Based Restricted Stock Awards [Member] | Minimum [Member]
Additional Disclosures [Abstract]
Vesting period of awards	3 years
Service-Based Restricted Stock Awards [Member] | Maximum [Member]
Additional Disclosures [Abstract]
Vesting period of awards	4 years
Performance-Based Restricted Stock Awards [Member]
Equity Award Activity [Roll Forward]
Outstanding, beginning balance (in shares)	214,809	209,754	179,774
Granted (in shares)	120,727	113,522	103,940
Awards vested or rights exercised (in shares)	(44,875)	(57,351)	(48,661)
Forfeited (in shares)	(76,766)	(51,116)	(25,299)
Outstanding, ending balance (in shares)	213,895	214,809	209,754
Expected to vest (in shares)	289,510
Weighted-Average Award Price [Roll Forward]
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 21.38	$ 21.56	$ 21.42
Granted (in dollars per share) | $ / shares	20.42	20.29	22.95
Awards vested or rights exercised (in dollars per share) | $ / shares	22.12	18.93	24.10
Forfeited (in dollars per share) | $ / shares	20.29	22.45	21.40
Outstanding, ending balance (in dollars per share) | $ / shares	21.08	$ 21.38	$ 21.56
Expected to vest (in dollars per share) | $ / shares	$ 20.90
Additional Disclosures [Abstract]
Fair value of vested shares | $	$ 755	$ 1,389	$ 988
Aggregate intrinsic value of outstanding awards | $	$ 5,918
Performance period	1 year
Cliff vesting period	3 years
Stock-Settled Appreciation Rights [Member]
Equity Award Activity [Roll Forward]
Outstanding, beginning balance (in shares)	7,500	57,000	57,000
Granted (in shares)	0	0	0
Awards vested or rights exercised (in shares)	(7,500)	(49,500)	0
Forfeited (in shares)	0	0	0
Outstanding, ending balance (in shares)	0	7,500	57,000
Exercisable (in shares)		7,500	57,000
Weighted-Average Award Price [Roll Forward]
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 18.14	$ 18.14	$ 18.14
Granted (in dollars per share) | $ / shares	0	0	0
Awards vested or rights exercised (in dollars per share) | $ / shares	18.14	18.14	0
Forfeited (in dollars per share) | $ / shares	0	0	0
Outstanding, ending balance (in dollars per share) | $ / shares	$ 0	18.14	18.14
Exercisable, ending balance (in dollars per share) | $ / shares		$ 18.14	$ 18.14
Additional Disclosures [Abstract]
Intrinsic value of awards exercised | $	$ 18	$ 107

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