v2.4.0.6
CONTINGENCIES - Condensed Shareholder's Equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]                      
Opening Balance VALUE       $ 248,911       $ 170,667 $ 248,911 $ 170,667 $ 113,952
Net income (loss) 7,347 8,177 (3,207) (1,049) 10,524 8,231 46,501 1,021 11,268 66,277 46,436
Stock Granted During Period, Value, Share-based Compensation, Net of Forfeitures                 210 462 549
Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures                 5,544 7,209 4,979
Issuance of common stock related to an incentive plan VALUE                 0 0 0
Common stock repurchase VALUE                 0 0 0
Purchase of vested employee restricted stock units VALUE                 1,367 3,057 1,628
Purchase of vested employee restricted stock units SHARES                 199,000 297,000 182,000
Forfeitures of dividend equivalents VALUE                 16 5 94
Realization of tax benefit for dividend equivalent payments VALUE                   0 0
Net unrealized gain (loss) on derivatives VALUE                 0 7,277 6,155
Exercise of stock options SHARES                 (101,350)    
Exercise of stock options VALUE                 135 71 130
Ending Balance VALUE 264,717       248,911       264,717 248,911 170,667
Common Class A [Member]
                      
Condensed Financial Statements, Captions [Line Items]                      
Opening Balance VALUE       310       307 310 307 297
Opening Balance SHARES       31,044,001       30,700,568 31,044,001 30,700,568 29,755,161
Net income (loss)                 0 0 0
Stock Granted During Period, Value, Share-based Compensation, Net of Forfeitures                 0 0 0
Stock Issued During Period Shares Restricted Stock Award Net Of Forfeitures                 280,072 416,906 941,213
Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures                 3 4 10
Stock Issued During Period Shares Employee Stock Purchase Plans                 0 0 0
Issuance of common stock related to an incentive plan VALUE                 0 0 0
Common stock repurchase SHARES                 0 0 0
Common stock repurchase VALUE                 0 0 0
Purchase of vested employee restricted stock units VALUE                 2 3 2
Purchase of vested employee restricted stock units SHARES                 199,376 297,098 183,531
Forfeitures of dividend equivalents VALUE                 0 0 0
Realization of tax benefit for dividend equivalent payments VALUE                   0 0
Net unrealized gain (loss) on derivatives VALUE                 0 0 0
Exercise of stock options SHARES                 101,350 53,625 97,725
Exercise of stock options VALUE                 1 0 1
Ending Balance SHARES 31,226,047       31,044,001       31,226,047 31,044,001 30,700,568
Ending Balance VALUE 312       310       312 310 307
Common Class B [Member]
                      
Condensed Financial Statements, Captions [Line Items]                      
Opening Balance VALUE       72       74 72 74 75
Opening Balance SHARES       7,197,532       7,367,532 7,197,532 7,367,532 7,457,532
Net income (loss)                 0 0 0
Stock Granted During Period, Value, Share-based Compensation, Net of Forfeitures                 0 0 0
Stock Issued During Period Shares Restricted Stock Award Net Of Forfeitures                 0 0 0
Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures                 0 0 0
Stock Issued During Period Shares Employee Stock Purchase Plans                 0 0 0
Issuance of common stock related to an incentive plan VALUE                 0 0 0
Common stock repurchase SHARES                 0 0 0
Common stock repurchase VALUE                 0 0 0
Purchase of vested employee restricted stock units VALUE                 0 0 0
Purchase of vested employee restricted stock units SHARES                 0 0 0
Forfeitures of dividend equivalents VALUE                 0 0 0
Realization of tax benefit for dividend equivalent payments VALUE                   0 0
Net unrealized gain (loss) on derivatives VALUE                 0 0 0
Exercise of stock options SHARES                 0 0 0
Exercise of stock options VALUE                 0 0 0
Ending Balance SHARES 7,197,532       7,197,532       7,197,532 7,197,532 7,367,532
Ending Balance VALUE 72       72       72 72 74
Additional Paid In Capital [Member]
                      
Condensed Financial Statements, Captions [Line Items]                      
Opening Balance VALUE       597,327       592,643 597,327 592,643 588,622
Net income (loss)                 0 0 0
Stock Granted During Period, Value, Share-based Compensation, Net of Forfeitures                 210 462 549
Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures                 5,541 7,205 4,969
Issuance of common stock related to an incentive plan VALUE                 0 0 0
Common stock repurchase VALUE                 0 0 0
Purchase of vested employee restricted stock units VALUE                 1,365 3,054 1,626
Forfeitures of dividend equivalents VALUE                 0 0 0
Realization of tax benefit for dividend equivalent payments VALUE                   0 0
Net unrealized gain (loss) on derivatives VALUE                 0 0 0
Exercise of stock options VALUE                 134 71 129
Ending Balance VALUE 601,847       597,327       601,847 597,327 592,643
Retained Earnings [Member]
                      
Condensed Financial Statements, Captions [Line Items]                      
Opening Balance VALUE       (348,798)       (415,080) (348,798) (415,080) (461,610)
Net income (loss)                 11,268 66,277 46,436
Stock Granted During Period, Value, Share-based Compensation, Net of Forfeitures                 0 0 0
Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures                 0 0 0
Issuance of common stock related to an incentive plan VALUE                 0 0 0
Common stock repurchase VALUE                 0 0 0
Purchase of vested employee restricted stock units VALUE                 0 0 0
Forfeitures of dividend equivalents VALUE                 16 5 94
Realization of tax benefit for dividend equivalent payments VALUE                   0 0
Net unrealized gain (loss) on derivatives VALUE                 0 0 0
Exercise of stock options VALUE                 0 0 0
Ending Balance VALUE (337,514)       (348,798)       (337,514) (348,798) (415,080)
Accumulated Other Comprehensive Income (Loss) [Member]
                      
Condensed Financial Statements, Captions [Line Items]                      
Opening Balance VALUE       0       (7,277) 0 (7,277) (13,432)
Net income (loss)                 0 0 0
Stock Granted During Period, Value, Share-based Compensation, Net of Forfeitures                 0 0 0
Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures                 0 0 0
Issuance of common stock related to an incentive plan VALUE                 0 0 0
Common stock repurchase VALUE                 0 0 0
Purchase of vested employee restricted stock units VALUE                 0 0 0
Forfeitures of dividend equivalents VALUE                 0 0 0
Realization of tax benefit for dividend equivalent payments VALUE                   0 0
Net unrealized gain (loss) on derivatives VALUE                 0 7,277 6,155
Exercise of stock options VALUE                 0 0 0
Ending Balance VALUE 0       0       0 0 (7,277)
Parent Company [Member]
                      
Condensed Financial Statements, Captions [Line Items]                      
Opening Balance VALUE       248,911         248,911    
Net income (loss)                 11,268 66,277 46,436
Ending Balance VALUE $ 264,717       $ 248,911       $ 264,717 $ 248,911