Stock-based Compensation (Details Narrative) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	$ 7,603us-gaap_ShareBasedCompensation	$ 18,128us-gaap_ShareBasedCompensation	$ 8,819us-gaap_ShareBasedCompensation
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Term	10 years
Allocated Share-based Compensation Expense	7,603	18,128	8,819
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	2,834	6,757	3,345
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	4,888	3,899	1,438
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	10,560
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	2 years 0 months 18 days
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options	11,024	13,034	6,415
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	11,178	14,022	4,225
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 12.14	$ 8.77	$ 9.49
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	6 months
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Period of Stock Options from Date of Grant	10 years
Exercise Period of Stock Options from Date of Retirement	5 years
Equity Award Modification [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense		$ 10,492

Exercise Period of Stock Options from Date of Grant

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Exercise Period of Stock Options from Date of Retirement

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Share Based Compensation Arrangement By Share Based Payment Award Maximum Term

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Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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

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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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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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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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