Stock Based Compensation (Details Textual) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum shares of common stock provided		4,000,000
Vesting period of shares	4 years
Number of options granted	419,000
Aggregate intrinsic value	$ 13,900,000
Aggregate intrinsic value exercisable	3,300,000
Quoted closing market price	$ 20.23
Weighted average contractual term	3 years 4 months 16 days
Total intrinsic value of options exercised	200,000	36,000,000	900,000
Tax related benefits realized from the exercise of stock options	100,000.0	0	0
Stock-based compensation expense	5,524,000us-gaap_ShareBasedCompensation	3,897,000us-gaap_ShareBasedCompensation	140,000us-gaap_ShareBasedCompensation
Stock based long term liability	1,400,000	1,200,000	300,000
Stock based current liability	0	100,000	100,000
Unrecognized compensation expense related to unvested stock options	5,900,000
Weighted average remaining requisite service period of unvested stock awards	1 year 5 months 22 days
Fair value of option shares vested	1,500,000	300,000	300,000
Restricted stock or unit expenses	3,023,000us-gaap_RestrictedStockExpense	1,618,000us-gaap_RestrictedStockExpense	758,000us-gaap_RestrictedStockExpense
Number of options, Options forfeited	(39,000)
Weighted average grant date fair value for options	$ 9.45	$ 3.91	$ 5.95
Granted option share purchase price, per share	$ 23.19
Aggregate intrinsic value for the restricted stock and restricted stock units outstanding	16,900,000
Tax benefits recognized for stock based compensation	1,900,000	1,100,000	300,000
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]
Vesting period of shares	3 years
Stock-based compensation expense	0	100,000	100,000
Weighted average remaining requisite service period of unvested stock awards	1 year 2 months 23 days
Defer issuance term	2 years
Vesting Period, beginning date	Mar. 19, 2012
Vesting period, end date	Apr. 15, 2015
Additional restricted stock vesting	116,841
Restricted stock grants		13,833
Restricted stock or unit expenses	3,000,000	1,600,000	700,000
Unrecognized compensation expense related to unvested restricted stock and restricted stock units	6,900,000
Fair value of restricted stock and restricted stock units vested	900,000	200,000	44,000
Restricted stock [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of shares	1 year	1 year
Restricted stock [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of shares	4 years	4 years
Restricted Stock Units Service Based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value, usd per share	$ 16.28	$ 10.79
Restricted stock grants	31,000
Restricted stock grants	28,000	54,166
Weighted average fair value, Granted	$ 25.36	$ 10.04
Restricted Stock Units Performance Based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum shares of common stock provided		116,841
Weighted average fair value, usd per share	$ 0.00	$ 0.00
Restricted stock grants	0
Restricted stock grants	0
Weighted average fair value, Granted	$ 0.00
Restricted Stock Performance Based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value, usd per share	$ 13.24	$ 13.24
Restricted stock grants	0
Restricted stock grants	0
Weighted average fair value, Granted	$ 0.00
Restricted Stock Service Based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value, usd per share	$ 14.03	$ 9.43
Restricted stock grants	51,000
Restricted stock grants	212,000	206,842
Weighted average fair value, Granted	$ 23.30	$ 9.66
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of shares	3 years
Maximum vesting period	5 years
Maximum vesting period	10 years
Stock-based compensation expense	$ 2,500,000	$ 2,200,000	$ (700,000)
Stock options [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of shares	3 years
Stock options [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of shares	4 years

Beginning of the measurement period for the vesting of the performance based awards.

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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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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 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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Unrecognized cost of unvested options awarded to employees as compensation.

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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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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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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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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.

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

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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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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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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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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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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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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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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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

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

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