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Share-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 08, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense recognized | $ 4,817 | $ 4,394 | $ 6,380 |
Unrecognized Compensation Cost | $ 3,060 |  |  |
Expiration date of 2007 Stock Incentive Plan | May 20, 2024 |  |  |
Outstanding: |  |  |  |
Beginning Balance (in shares) |  | 77,000 |  |
Beginning Balance, weighted average exercise price (in dollars per share) |  | $ 16.29 |  |
Granted (in shares) | 0 | 0 | 0 |
Granted, weighted average exercise price (in dollars per share) | $ 0 | $ 0 | $ 0 |
Stock options exercised (in shares) |  | 77,334 | 27,619 |
Exercised, weighted average exercise price (in dollars per share) |  |  | $ 0 |
Ending Balance (in shares) |  |  | 77,000 |
Ending balance, weighted average exercise price (in dollars per share) |  |  | $ 16.29 |
Exercisable (in shares) |  |  |  |
Stock price per share (in dollars per share) |  |  |  | $ 24.70
Intrinsic value under share based compensation scheme |  | $ 20 | $ 85 |
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense recognized | $ 4,603 | $ 4,231 | $ 6,263 |
Unrecognized Compensation Cost | $ 3,060 |  |  |
Weighted Average Remaining Amortization Periods (in years) | 9 months 18 days |  |  |
Exercisable (in shares) |  |  |  |
Expected to vest | 904,000 | 986,000 | 1,004,000 |
Outstanding: |  |  |  |
Balance (in shares) | 986,000 | 1,004,000 | 1,028,000 |
Granted (in shares) | 252,000 | 304,000 | 353,000 |
Vested (in shares) | (334,000) | (322,000) | (155,000) |
Cancelled or forfeited (in shares) | 0 | 0 | (222,000) |
Balance (in shares) | 904,000 | 986,000 | 1,004,000 |
Beginning balance, Weighted average grant-date fair value (in dollars per share) | $ 13.34 | $ 12.74 | $ 13.24 |
Granted, Weighted average grant-date fair value (in dollars per share) | 18.90 | 15.52 | 11.35 |
Vested, Weighted average grant-date fair value (in dollars per share) | 13.67 | 13.54 | 12.27 |
Forfeitures, Weighted average grant date fair value | 0 | 0 | 13.19 |
Ending balance, Weighted average grant-date fair value (in dollars per share) | $ 14.77 | $ 13.34 | $ 12.74 |
Phantom Stock Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense recognized | $ 214 | $ 163 | $ 117 |
Unrecognized Compensation Cost | $ 0 |  |  |
Weighted Average Remaining Amortization Periods (in years) | 0 years |  |  |
Outstanding: |  |  |  |
Balance (in shares) | 157,000 | 145,000 | 132,000 |
Granted (in shares) | 10,000 | 10,000 | 10,000 |
Dividend equivalents issued | 3,000 | 2,000 | 3,000 |
Redeemed for common stock (in shares) | 0 | 0 | 0 |
Balance (in shares) | 170,000 | 157,000 | 145,000 |
Granted, Weighted average grant-date fair value (in dollars per share) | $ 21.35 | $ 16.25 | $ 11.71 |
Performance Vested Restricted Stock Units [Member] | Scheduled to Vest January 1, 2019 [Member] |  |  |  |
Exercisable (in shares) |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Not Expected To Vest Outstanding Number | 0 |  |  |
Expected to vest | 213,000 |  |  |
Outstanding: |  |  |  |
Balance (in shares) | 213,000 |  |  |
Performance Vested Restricted Stock Units [Member] | Scheduled to Vest January 1, 2020 [Member] |  |  |  |
Exercisable (in shares) |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Not Expected To Vest Outstanding Number | 0 |  |  |
Expected to vest | 167,000 |  |  |
Outstanding: |  |  |  |
Balance (in shares) | 167,000 |  |  |
Performance Vested Restricted Stock Units [Member] | Scheduled to Vest January 1, 2021 [Member] |  |  |  |
Exercisable (in shares) |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Not Expected To Vest Outstanding Number | 0 |  |  |
Expected to vest | 141,000 |  |  |
Outstanding: |  |  |  |
Balance (in shares) | 141,000 |  |  |
2007 Stock Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum number of shares authorized under restricted stock, unrestricted stock, RSU's and stock options to officers, employees and non-employee directors (in shares) | 6,500,000 |  |  |
Exercisable (in shares) |  |  |  |
Available for future grants (in shares) | 2,894,000 |  |  |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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=109197908&loc=d3e5070-113901 + Details
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