| **Common Stock (Tables)**                                                                                                | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
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| **Equity [Abstract]**                                                                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan | The following table provides a summary of the impact of our outstanding stock-based compensation plans on the results of operations for the periods presented:  Three Months Ended September 30, Nine Months Ended September 30,  2013 2012 2013 2012  (in thousands)         Stock-based compensation expense $3,040 $2,225 $9,991 $6,126Income tax benefit (1,161) (847) (3,816) (2,333)Net stock-based compensation expense $1,879 $1,378 $6,175 $3,793                                                                                                                                                                                                                                                                                                                                                                                                       |
| Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions                                              | In January 2013, the Compensation Committee awarded 87,078 SARs to our executive officers. The fair value of each SAR award was estimated on the date of grant using a Black-Scholes pricing model using the following assumptions: Grant-Year 2013 2012    Expected term of award6 years 6 yearsRisk-free interest rate1.0% 1.1%Expected volatility65.5% 64.3%Weighted-average grant date fair value per share$21.96 $17.61                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| Schedule of Share-based Compensation, Stock Appreciation Rights Award Activity                                           | The following table presents the changes in our SARs:  Nine Months Ended September 30, 2013 2012 Number ofSARs Weighted-AverageExercisePrice Average Remaining ContractualTerm        (in years) Aggregate IntrinsicValue              (in thousands) Number ofSARs Weighted-AverageExercisePrice Average Remaining ContractualTerm        (in years) Aggregate IntrinsicValue              (in thousands)Outstanding beginning of year, January 1,118,832 $30.80 8.4 $486 50,471 $31.61 8.6 $341Awarded87,078 37.18 — — 68,361 30.19 9.3 —Outstanding at September 30,205,910 33.50 8.4 5,363 118,832 30.80 8.7 328Vested and expected to vest at September 30, 198,163 33.41 8.4 5,178 113,426 30.77 8.7 319Exercisable at September 30,67,069 29.99 7.3 1,982 27,458 28.84 7.8 153                            |
| Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity                               | The following table presents the changes in non-vested time-based awards for the nine months ended September 30, 2013:  Shares Weighted-AverageGrant-DateFair Value    Non-vested at December 31, 2012646,490 $27.93Granted292,548 44.56Vested(265,312) 27.53Forfeited(22,507) 31.29Non-vested at September 30, 2013651,219 35.45     As of/Year Ended September 30, 2013 2012 (in thousands, except per share data)    Total intrinsic value of time-based awards vested$12,562 $4,818Total intrinsic value of time-based awards non-vested38,774 21,996Market price per common share as of September 30,59.54 31.63Weighted-average grant date fair value per share44.56 26.48                                                                                                                                                                                                                                             |
| Restricted Stock Awards, Market-Based, Valuation assumptions                                                             | In January 2013, the Compensation Committee awarded a total of 41,570 market-based restricted shares to our executive officers. In addition to continuous employment, the vesting of these shares is contingent on the Company's total shareholder return ("TSR"), which is essentially the Company’s stock price change including any dividends, as compared to the TSR of a set group of 16 peer companies. The shares are measured over a three-year period ending on December 31, 2015 and can result in a payout between 0% and 200% of the total shares awarded. The weighted-average grant date fair value per market-based share for these awards granted was computed using the Monte Carlo pricing model using the following assumptions:  Nine Months Ended September 30,  2013 2012     Expected term of award 3 years 3 yearsRisk-free interest rate 0.4% 0.3%Expected volatility 56.6% 65.3%Weighted-average grant date fair value per share $49.04 $36.54 |
| Schedule of Nonvested Performance-based Units Activity                                                                   | The following table presents the change in non-vested market-based awards during nine months ended September 30, 2013:  Shares Weighted-AverageGrant-DateFair Value per Share     Non-vested at December 31, 2012 40,696 $39.22Granted 41,570 49.04Non-vested at September 30, 2013 82,266 44.18      As of/Year Ended September 30, 2013 2012 (in thousands, except per share data)    Total intrinsic value of market-based awards non-vested$4,898 $2,329Market price per common share as of September 30,59.54 31.63Weighted-average grant date fair value per share49.04 36.54                                                                                                                                                                                                                                                                                                                           |

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Restricted Stock Awards, Market-Based, Valuation assumptions [Table Text Block]
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| - Definition
Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits.
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Tabular disclosure of the changes in outstanding nonvested performance-based units.
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Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.
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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock appreciation rights awards that were outstanding at the beginning and end of the year, and the number of stock appreciation rights awards that were granted, exercised or converted, forfeited, and expired during the year.
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| - Definition
Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.
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