| **COMMON STOCK Common Stock (Tables)**                                                                                                      | 12 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 [Table Text Block] | 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:  Year Ended December 31,  2015 2014 2013  (in thousands)       Stock-based compensation expense $20,068 $17,518 $12,880Income tax benefit (7,636) (5,955) (4,697)Net stock-based compensation expense $12,432 $11,563 $8,183                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]                                              | In January 2015, the Compensation Committee awarded 68,274 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: Year Ended December 31, 2015 2014 2013      Expected term of award5.2 years 6 years 6 yearsRisk-free interest rate1.4% 2.1% 1.0%Expected volatility58.0% 65.6% 65.5%Weighted-average grant date fair value per share$22.23 $29.96 $21.96                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Schedule of Share-based Compensation, Stock Appreciation Rights Award Activity [Table Text Block]                                           | The following table presents the changes in our SARs for all periods presented:  Year Ended December 31, 2015 2014 2013 Number ofSARs Weighted-AverageExercisePrice Average Remaining ContractualTerm        (in years) Aggregate IntrinsicValue              (in thousands) Number ofSARs Weighted-AverageExercisePrice Aggregate IntrinsicValue              (in thousands) Number ofSARs Weighted-AverageExercisePrice Aggregate IntrinsicValue              (in thousands)Outstanding beginning of year, January 1,279,011 $38.77 7.8 $1,472 190,763 $33.77 $3,711 118,832 $30.80 $486Awarded68,274 39.63 — — 88,248 49.57 — 87,078 37.18 —Exercised(20,832) 38.05 — 473 — — — (15,147) 30.06 425Outstanding at December 31,326,453 38.99 7.3 4,697 279,011 38.77 1,472 190,763 33.77 3,711Exercisable at December 31,222,489 37.70 6.8 3,489 139,334 36.27 982 51,922 29.97 1,207 |
| Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]                               | The following table presents the changes in non-vested time-based awards during 2015:  Shares Weighted-AverageGrant-DateFair Value    Non-vested at December 31, 2014564,332 $46.02Granted313,639 48.88Vested(333,167) 41.59Forfeited(19,723) 54.29Non-vested at December 31, 2015525,081 50.23    The following table presents the weighted-average grant date fair value per share and related information as of/for the periods presented: As of/Year Ended December 31, 2015 2014 2013 (in thousands, except per share data)      Total intrinsic value of time-based awards vested$17,077 $18,278 $13,640Total intrinsic value of time-based awards non-vested28,029 23,290 34,688Market price per common share as of December 31,53.38 41.27 53.22Weighted-average grant date fair value per share48.88 56.45 45.53                                                                                                                                                                                                                                           |
| Restricted Stock Awards, Market-Based, Valuation assumptions [Table Text Block]                                                             | 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:  Year Ended December 31,  2015 2014     Expected term of award 3 years 3 yearsRisk-free interest rate 0.9% 0.8%Expected volatility 53.0% 55.2%Weighted-average grant date fair value per share $66.16 $56.87                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Schedule of Nonvested Performance-based Units Activity [Table Text Block]                                                                   | The following table presents the change in non-vested market-based awards during 2015:  Shares Weighted-AverageGrant-DateFair Value per Share     Non-vested at December 31, 2014 83,721 $52.98Granted 29,398 66.16Vested (41,570) 49.04Non-vested at December 31, 2015 71,549 63.60     The following table presents the weighted-average grant date fair value per share and related information as of/for the periods presented: As of/Year Ended December 31, 2015 2014 2013 (in thousands, except per share data)      Total intrinsic value of market-based awards vested$4,293 $1,260 $724Total intrinsic value of market-based awards non-vested3,819 3,455 3,838Market price per common share as of December 31,53.38 41.27 53.22Weighted-average grant date fair value per share66.16 56.87 49.04                                                                                                                                                                                                                           |

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| - Definition
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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| - Definition
Tabular disclosure of the changes in outstanding nonvested performance-based units.
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| - Definition
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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| - Definition
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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