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Stock-Based Compensation Plans - Restricted Stock Activity (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Apr. 01, 2018 | May 31, 2007
2007 Stock Incentive Plan |  |  |  |
Aggregate Grant Date Fair Value |  |  |  |
Number of shares authorized (in shares) |  |  |  | 2,800,000
Employee Stock Purchase Plan |  |  |  |
Aggregate Grant Date Fair Value |  |  |  |
Number of shares authorized (in shares) |  |  | 325,000 |
Maximum percentage of cash compensation allowed to be deducted for the purchase of common stock by eligible employees | 10.00% |  |  |
Maximum number of shares to be purchased by employee in one calendar year (in shares) | 1,000 |  |  |
Maximum amount of shares to be purchased by employee in one calendar year | $ 25,000 |  |  |
Purchase price expressed as a percentage of the market price of the common stock on the purchase date or on the date of entry | 85.00% |  |  |
Shares issued (in shares) | 11,394 | 13,193 |  |
Restricted Stock |  |  |  |
Number Outstanding |  |  |  |
Balance at the beginning of the period (in shares) | 505,467 | 417,890 |  |
Shares granted (in shares) | 319,350 | 279,400 |  |
Shares forfeited (in shares) | 0 | (3,866) |  |
Shares vested (in shares) | (243,102) | (187,957) |  |
Balance at the end of the period (in shares) | 581,715 | 505,467 |  |
Weighted Average Grant Date Fair Value |  |  |  |
Balance at the beginning of the period (in dollars per share) | $ 37.70 | $ 30.54 |  |
Shares granted (in dollars per share) | 19.00 | 42.28 |  |
Shares cancelled (in dollars per share) | 0 | 30.43 |  |
Shares vested (in dollars per share) | 28.35 | 28.74 |  |
Balance at the end of the period (in dollars per share) | $ 31.34 | $ 37.70 |  |
Aggregate Grant Date Fair Value |  |  |  |
Balance at beginning of period | $ 19,056,000 | $ 12,763,000 |  |
Granted | 6,068,000 | 11,813,000 |  |
Forfeited | 0 | (118,000) |  |
Vested | (6,892,000) | (5,402,000) |  |
Balance at end of period | $ 18,232,000 | $ 19,056,000 |  |
Restricted Stock | 2007 Stock Incentive Plan |  |  |  |
Aggregate Grant Date Fair Value |  |  |  |
Remaining average vesting period for recognition of unrecognized compensation expense | 1 year 3 months 18 days |  |  |
Unrecognized compensation expense | $ 9,200,000 |  |  |
Intrinsic value of unvested shares | $ 17,700,000 |  |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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=120381028&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=120381028&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=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&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=120381028&loc=d3e5070-113901 + Details
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