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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 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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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 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.

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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 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.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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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 number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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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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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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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Level 4 Stock-Based Compensation (Details) (USD $)	3 Months Ended	6 Months Ended		12 Months Ended
Level 4 Stock-Based Compensation (Details) (USD $)	Jun. 30, 2013	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock-Based Compensation [Abstract]
Maximum number of shares approved for issuance under stock-based compensation plan	3,100,000	3,100,000
Number of shares available for future issuance under stock-based compensation plan	2,800,000	2,800,000
Number of Options [Abstract]
Stock options, Outstanding, December 31, 2012		0
Stock options, Granted		161,257
Stock options, Outstanding, June 30, 2013	161,257	161,257		0
Stock options, Vested and expected to vest, June 30, 2013	132,484	132,484
Stock options, Exercisable, June 30, 2013	0	0
Weighted Average Exercise Price Per Option [Abstract]
Weighted average exercise price, Outstanding at December 31, 2012		$ 0.00
Weighted average exercise price, Granted		$ 27.19
Weighted average exercise price, Outstanding at June 30, 2013	$ 27.19	$ 27.19		$ 0.00
Weighted average exercise price, Vested and expected to vest, June 30, 2013	$ 27.19	$ 27.19
Weighted average exercise price, Exercisable, June 30, 2013	$ 0.00	$ 0.00
Weighted Average Remaining Contractual Life (years) [Abstract]
Weighted average remaining life (years), Outstanding, June 30, 2013		9 years 7 months 25 days
Weighted average remaining life (years), Vested and expected to vest, June 30, 2013		9 years 7 months 25 days
Aggregate Intrinsic Value (thousands) [Abstract]
Aggregate intrinsic value (thousands), Outstanding, June 30, 2013	$ 0	$ 0
Aggregate intrinsic value (thousands), Vested and expected to vest, June 30, 2013	0	0
Aggregate intrinsic value (thousands), Exercisable, June 30, 2013	0	0
Assumptions used to calculate the fair value of stock options [Abstract]
Expected volatility		60.90%
Expected life (in years)		6 years
Risk-free interest rate		1.00%
Expected dividends		0.00%
Weighted average fair value per option granted		$ 14.87
Unvested, Number of shares [Abstract]
Unvested, December 31, 2012, Unvested shares		0
Granted, Unvested shares		104,285
Unvested, June 30, 2013, Unvested shares	104,285	104,285		0
Weighted Average Grant Date Fair Value [Abstract]
Unvested, December 31, 2012, Weighted Average Grant Date Fair Value		$ 0.00
Granted, Weighted Average Grant Date Fair Value		$ 26.65
Unvested, June 30, 2013, Weighted Average Grant Date Fair Value	$ 26.65	$ 26.65		$ 0.00
Compensation Expense [Abstract]
Stock-based compensation expense	830,000	1,073,000	0	0	0	1,625,000
Remaining unrecognized compensation expense	3,600,000	3,600,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition		2 years 3 months
Stock Options [Member]
Compensation Expense [Abstract]
Stock-based compensation expense	195,000	268,000
Performance Stock Unit [Member]
Unvested, Number of shares [Abstract]
Granted, Unvested shares		90,124
Restricted Stock Unit [Member]
Unvested, Number of shares [Abstract]
Granted, Unvested shares		14,161
Performance Stock Unit and Restricted Stock Unit [Member]
Compensation Expense [Abstract]
Stock-based compensation expense	$ 635,000	$ 805,000