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Stock-Based Compensation Plans (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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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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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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