Increase (decrease) in restricted stock expense.

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Share based compensation arrangement by share based payment award, award vesting condition revenue target.

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Share-based compensation arrangement by share-based payment award, awards grant on meeting performance criteria, percent.

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Share-based compensation arrangement by share-based payment award, shares issuable on meeting performance criteria.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy.

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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).

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- Definition

For each plan, identification of the award pricing model or other valuation method used in calculating the weighted average fair values disclosed. The model is also used to calculate the compensation expense that is shown within the balance sheet, income statement, and cash flow. Examples of valuation techniques are lattice models (binomial model), closed-form models (Black-Scholes-Merton formula), and a Monte Carlo simulation technique. Fair value is the amount at which an asset or liability could be bought or incurred or sold or settled in a current transaction between willing parties, that is, other than in a forced or liquidation sale. May include disclosures about the assumptions underlying application of the method selected.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Number of additional shares authorized for issuance under an established share-based compensation plan.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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- Definition

Gross number of share options (or share units) granted during the period.

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No definition available.

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An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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- Definition

The number of employees affected by the modification of an equity-based compensation plan.

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Number of shares for which recognition of compensation cost was accelerated.

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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.

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Share-Based Compensation - Additional Information (Details) $ in Thousands	1 Months Ended		3 Months Ended								12 Months Ended
	May 31, 2017 shares	May 31, 2013 shares	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) CorporateOfficer shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, fair value assumptions, method used											Share-based compensation expense for stock options granted in previous years was calculated on the date of grant using the Black-Scholes-Merton option-pricing model
Stock options granted, shares											0	0
Cash proceeds received from stock option exercises \| $											$ 4,900	$ 13,600	$ 100
Performance-based/restricted stock grant covering shares											646,000	746,000	880,000
Revenue \| $			$ 314,446	$ 320,946	$ 304,085	$ 274,512	$ 268,430	$ 285,247	$ 264,224	$ 236,303	$ 1,213,989	$ 1,054,204	$ 942,162
Corporate Officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of employees impacted by stock modification \| CorporateOfficer											2
Corporate Officers \| Selling, General and Administrative Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental expense \| $											$ 1,800
Performance Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock expense \| $													$ (2,700)
Performance Grants \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-based/restricted stock grant covering shares											600,000
Payout percentage of award subject to performance criteria												200.00%
Performance-based grant covering shares												125,810
Incremental expense \| $												$ 3,300
Revenue target for performance-based stock units vesting \| $											$ 1,000,000
Performance Grants \| Chief Executive Officer \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-based grant covering shares, description											During 2017, the Company modified a performance-based award previously granted to our Chief Executive Officer.
Performance Grants \| Chief Executive Officer \| Common Stock \| Previous Performance Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-based/restricted stock grant covering shares												700,000
Performance Grants \| Chief Executive Officer \| Common Stock \| Current Performance Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-based/restricted stock grant covering shares												62,905
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized \| $			0								$ 0
Stock Options \| Corporate Officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock modification, number of shares subject to accelerated vesting											7,500
Stock Options \| Plan 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, description											Stock options under the 2013 Plan generally vest in equal annual installments over a four-year period and expire eight years after the grant date
Share-based compensation arrangement by share-based payment award, award vesting period		4 years
Share-based compensation arrangement by share-based payment award, expiration period		8 years
Share-based compensation arrangement by share-based payment award, number of shares authorized	12,000,000	6,000,000
Share-based compensation arrangement by share-based payment award, number of additional shares authorized	6,000,000
Restricted Stock Awards and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period											4 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized \| $			$ 35,200								$ 35,200
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition											2 years 2 months 12 days
Restricted Stock \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental expense \| $												$ 1,700
Restricted Stock \| Chief Executive Officer \| Common Stock \| Current Performance Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-based/restricted stock grant covering shares												62,905
Stock Awards \| Corporate Officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock modification, number of shares subject to accelerated vesting											79,720