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Share based compensation arrangement by share based payment award equity instruments other than options outstanding aggregate intrinsic value.

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Share based compensation arrangement by share based payment award expiration period maximum.

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Share based compensation arrangement by share based payment award expiration period one maximum.

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Share based compensation arrangement by share based payment award options grants in period fair value.

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Stock allocated during period for shares stock options or restricted stock grants.

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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer).

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No definition available.

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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable within one year (or the operating cycle, if longer). Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

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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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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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No definition available.

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Unrecognized cost of unvested options awarded to employees as compensation.

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No definition available.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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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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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

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).

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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- Definition

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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No definition available.

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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

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of share instruments newly issued under a share-based compensation plan.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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No definition available.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of non-vested options outstanding.

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No definition available.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Stock Based Compensation (Details Textual) - USD ($)		12 Months Ended
Stock Based Compensation (Details Textual) - USD ($)	Feb. 19, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 10, 2015	Jun. 09, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum shares of common stock provided						8,700,000	4,000,000
Vesting period of shares		3 years
Aggregate intrinsic value		$ 13,300,000
Aggregate intrinsic value exercisable		$ 6,700,000
Quoted closing market price		$ 19.77
Weighted average contractual term		2 years 2 months 16 days
Total intrinsic value of options exercised		$ 1,300,000	$ 200,000	$ 36,000
Tax related benefits realized from the exercise of stock options		300,000.0	100,000	0
Stock-based compensation expense		9,450,000	5,524,000	3,897,000
Stock based long term liability		0	1,400,000	1,200,000
Stock based current liability		1,000,000	0	100,000
Unrecognized compensation expense related to unvested stock options		$ 8,500,000
Weighted average remaining requisite service period of unvested stock awards		1 year 9 months 22 days
Fair value of option shares vested		$ 1,300,000	1,500,000	300,000
Restricted stock or unit expenses		$ 0	3,023,000	1,618,000
Granted option share purchase price, per share		$ 22.32
Aggregate intrinsic value for the restricted stock and restricted stock units outstanding		$ 18,200,000
Tax benefits recognized for stock based compensation		$ 3,400,000	1,900,000	1,100,000
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of shares		3 years
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of shares		4 years
Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum shares that may be issued pursuant to options or restricted stock grants		3,481,569
Restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average remaining requisite service period of unvested stock awards		1 year 7 months 6 days
Defer issuance term		2 years
Restricted stock or unit expenses		$ 4,700,000	3,000,000	1,600,000
Unrecognized compensation expense related to unvested restricted stock and restricted stock units		10,300,000
Fair value of restricted stock and restricted stock units vested		$ 800,000	900,000	200,000
Restricted Stock Units Service Based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock grants		36,000
Restricted stock grants		39,000
Weighted average fair value, Granted		$ 24.58
Restricted Stock Performance Based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock grants		0			116,841
Restricted stock grants		96,590
Weighted average fair value, Granted		$ 0.00
Restricted Stock Units Performance Based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock grants		0			116,841
Restricted stock grants		96,590
Weighted average fair value, Granted		$ 0
Restricted Stock Performance Based and Restricted Stock Units Performance Based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value, Granted					$ 13.24
Restricted Stock Service Based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock grants		430,000
Restricted stock grants		8,000
Weighted average fair value, Granted		$ 22.51
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum vesting period		5 years
Maximum vesting period		10 years
Stock-based compensation expense		$ 4,700,000	$ 2,500,000	$ 2,200,000
Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted option share purchase price, per share	$ 15.00
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Fair Value	$ 7.0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares	608,287
Subsequent Event [Member] \| Restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	243,428