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Stock-Based Compensation (Stock Appreciation Rights) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 30, 2019 | Mar. 31, 2019 | Jul. 31, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jul. 31, 2019 | Jul. 30, 2018
Number of Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  | 229,344 |  |  |  |  |
SARS exercised, shares |  |  |  |  |  |  |  | (43,594) |  |  |  |  |
Forfeited (in shares) |  |  |  |  |  |  |  | (22,977) |  |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |
Options vested, outstanding (in shares) |  |  |  |  |  |  |  | 1,458,484 |  |  |  |  |
Share-based Compensation, Shares Authorized Under Stock Appreciation Rights, Exercise Price Range, Number Of Unvested Shares |  |  |  |  |  |  |  | 449,736 |  |  |  |  |
Weighted Average Exercise Price Per Share (in dollars per share) |  |  |  |  |  |  |  | $ 16.44 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms |  |  |  |  |  |  |  | 6 years 3 months 29 days |  |  |  |  |
Number of exercisable options (in shares) |  |  |  |  |  |  |  | 1,458,484 |  |  |  |  |
Weighted average exercise price per share (in dollars per share) |  |  |  |  |  |  |  | $ 15.33 |  |  |  |  |
Unvested activity |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  | 277,307 |  |  |  |  |
Nonvested at the end of the period (in shares) |  |  |  |  |  |  |  | 465,584 | 494,882 |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period |  |  |  |  |  |  |  | (70,391) |  |  |  |  |
$7.00-$13.70 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |
Options vested, outstanding (in shares) |  |  |  |  |  |  |  | 624,693 |  |  |  |  |
Share-based Compensation, Shares Authorized Under Stock Appreciation Rights, Exercise Price Range, Number Of Unvested Shares |  |  |  |  |  |  |  | 83,654 |  |  |  |  |
Weighted Average Exercise Price Per Share (in dollars per share) |  |  |  |  |  |  |  | $ 9.42 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms |  |  |  |  |  |  |  | 6 years 7 months 24 days |  |  |  |  |
Number of exercisable options (in shares) |  |  |  |  |  |  |  | 624,693 |  |  |  |  |
Weighted average exercise price per share (in dollars per share) |  |  |  |  |  |  |  | $ 8.85 |  |  |  |  |
$16.53 - $22.70 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |
Options vested, outstanding (in shares) |  |  |  |  |  |  |  | 584,950 |  |  |  |  |
Share-based Compensation, Shares Authorized Under Stock Appreciation Rights, Exercise Price Range, Number Of Unvested Shares |  |  |  |  |  |  |  | 361,000 |  |  |  |  |
Weighted Average Exercise Price Per Share (in dollars per share) |  |  |  |  |  |  |  | $ 19.45 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms |  |  |  |  |  |  |  | 6 years 7 months 6 days |  |  |  |  |
Number of exercisable options (in shares) |  |  |  |  |  |  |  | 584,950 |  |  |  |  |
Weighted average exercise price per share (in dollars per share) |  |  |  |  |  |  |  | $ 18.23 |  |  |  |  |
$23.03 - $26.92 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |
Options vested, outstanding (in shares) |  |  |  |  |  |  |  | 248,841 |  |  |  |  |
Share-based Compensation, Shares Authorized Under Stock Appreciation Rights, Exercise Price Range, Number Of Unvested Shares |  |  |  |  |  |  |  | 5,082 |  |  |  |  |
Weighted Average Exercise Price Per Share (in dollars per share) |  |  |  |  |  |  |  | $ 24.78 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms |  |  |  |  |  |  |  | 4 years 5 months 12 days |  |  |  |  |
Number of exercisable options (in shares) |  |  |  |  |  |  |  | 248,841 |  |  |  |  |
Weighted average exercise price per share (in dollars per share) |  |  |  |  |  |  |  | $ 24.79 |  |  |  |  |
Stock options |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  | 3 years |  |  |  |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |
Recognized stock-based compensation expense |  |  |  |  |  |  | $ 0 |  |  |  | $ 0 |  |
Unrecognized stock-based compensation expense |  |  |  |  |  |  |  |  | $ 0 |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options exercised |  |  |  |  |  |  | 0 |  |  |  | 0 |  |
Proceeds from Stock Options Exercised |  |  |  |  |  |  | $ 0 |  |  |  | $ 0 |  |
Stock options | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration period (in years) |  |  |  |  |  | 7 years |  |  |  |  |  |  |
Stock Appreciation Rights (SARs) |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercised in Period, Weighted Average Exercise Price |  |  |  |  |  |  |  | $ 15.87 |  |  |  |  |
Fair value assumptions |  |  |  |  |  |  |  |  |  |  |  |  |
Risk-free interest rate (as a percent) | 1.84% | 2.52% | 2.87% | 2.69% | 2.17% |  |  |  |  |  |  |  |
Dividend yield (as a percent) | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% |  |  |  |  |  |  |  |
Expected life | 6 years | 6 years | 6 years | 6 years | 6 years |  |  |  |  |  |  |  |
Volatility (as a percent) | 47.10% | 46.20% | 44.70% | 44.60% | 43.90% |  |  |  |  |  |  |  |
SAR grant price (usd per share) |  | $ 22.51 |  | $ 19.80 | $ 13.70 | $ 22.51 | $ 19.80 |  |  |  |  | $ 27.39 | $ 24.65
Number of Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at beginning of period (in shares) |  |  |  |  |  | 1,745,447 |  | 1,745,447 |  |  |  |  |
Outstanding at end of period (in shares) |  |  |  |  |  |  |  | 1,908,220 | 1,745,447 |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at beginning of period (usd per share) |  |  |  |  |  | $ 15.73 |  | $ 15.73 |  |  |  |  |
Granted (usd per share) |  |  |  |  |  |  |  | 22.79 |  |  |  |  |
Forfeited/expired (usd per share) |  |  |  |  |  |  |  | 26.94 |  |  |  |  |
Outstanding at end of period |  |  |  |  |  |  |  | $ 16.44 | $ 15.73 |  |  |  |
Outstanding - Aggregate Intrinsic Value |  |  |  |  |  |  |  | $ 13,000,000.0 | $ 8,900,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Exercised |  |  |  |  |  |  |  | 300,000 | 500,000 |  | $ 0 |  |
Recognized stock-based compensation expense |  |  |  |  |  |  |  | 1,900,000 | $ 1,800,000 | $ 1,900,000 |  |  |
Unrecognized stock-based compensation expense |  |  |  |  |  |  |  | $ 2,400,000 |  |  |  |  |
Unrecognized stock-based compensation expense, period of recognition |  |  |  |  |  |  |  | 1 year 9 months 18 days |  |  |  |  |
Unvested activity |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  | 229,344 |  |  |  |  |
Nonvested at the end of the period (in shares) |  |  |  |  |  |  |  | 449,736 | 467,478 |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |
Nonvested at the beginning of the period (in dollars per share) |  |  |  |  |  | $ 6.65 |  | $ 6.65 |  |  |  |  |
Granted (in dollars per share) | $ 12.80 | $ 10.62 | $ 11.48 | $ 9.16 | $ 6.13 |  |  | 10.75 |  |  |  |  |
Vested (in dollars per share) |  |  |  |  |  |  |  | 5.17 |  |  |  |  |
Forfeited (in dollars per share) |  |  |  |  |  |  |  | 12.80 |  |  |  |  |
Nonvested at the end of the period (in dollars per share) |  |  |  |  |  |  |  | $ 9.32 | $ 6.65 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period |  |  |  |  |  |  |  | (233,842) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period |  |  |  |  |  |  |  | (13,244) |  |  |  |  |
Stock Appreciation Rights (SARs) | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  | 3 years |  |  |  |  |  |  |
Stock Appreciation Rights (SARs) | $7.00-$13.70 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |
Range of Exercisable Prices, low end of range (in dollars per share) |  |  |  |  |  | $ 7 |  |  |  |  |  |  |
Range of Exercisable Prices, high end of range (in dollars per share) |  |  |  |  |  | 13.70 |  |  |  |  |  |  |
Stock Appreciation Rights (SARs) | $16.53 - $22.70 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |
Range of Exercisable Prices, low end of range (in dollars per share) |  |  |  |  |  | 16.53 |  |  |  |  |  |  |
Range of Exercisable Prices, high end of range (in dollars per share) |  |  |  |  |  | 22.70 |  |  |  |  |  |  |
Stock Appreciation Rights (SARs) | $23.03 - $26.92 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |
Range of Exercisable Prices, low end of range (in dollars per share) |  |  |  |  |  | 23.03 |  |  |  |  |  |  |
Range of Exercisable Prices, high end of range (in dollars per share) |  |  |  |  |  | $ 26.92 |  |  |  |  |  |  |
2013 Equity and Incentive Compensation Plan | Stock Appreciation Rights (SARs) |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration period (in years) |  |  |  |  |  | 10 years |  |  |  |  |  |  |
Unvested activity |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) | 13,244 | 216,100 | 7,622 | 221,818 | 266,540 |  |  |  |  |  |  |  |
2013 Equity and Incentive Compensation Plan | Stock Appreciation Rights (SARs) | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  | 5 years |  |  |  |  |  |  |

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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=116856206&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=116856206&loc=d3e5070-113901 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + 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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of non-option equity instruments exercised by participants. + 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)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Net number of non-option equity instruments granted to participants. + 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)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + 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)(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: 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)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options. + References No definition available. + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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