Annual report pursuant to Section 13 and 15(d)

Supplemental Cash Flow Information (Supplemental Cash Flow Information) (Details)

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Supplemental Cash Flow Information (Supplemental Cash Flow Information) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Supplemental Cash Flow Information [Abstract]      
Cash paid for interest, net of interest capitalized of $9,877 in 2011, $5,395 in 2010 and $6,662 in 2009 $ 39,772,000 $ 36,362,000 $ 37,286,000
Cash paid for income taxes 35,655,000 12,000,000 100,000
Cash paid for share-based compensation 1,062,000 [1] 452,000 [1] 162,000 [1]
Cash tax benefit related to share-based compensation 3,125,000 [2] 6,871,000 [2]    [2]
Interest capitalized 9,877,000 5,395,000 6,662,000
Refund of federal income taxes paid in prior years $ 400,000 $ 99,800,000 $ 22,300,000
[1] The cash paid for share-based compensation is for dividends on unvested restricted stock and for dividend equivalents paid on RSUs. No cash was received from employees or directors related to share-based compensation and no cash was used to settle any equity instruments granted under share-base compensation arrangements.
[2] The cash tax benefit for share-based compensation is attributable to tax deductions for vested restricted shares, tax deductions for dividends paid on unvested restricted stock and tax deductions related to dividend equivalents paid on RSUs. Tax refunds were received in 2010 that included carrybacks of net operating losses for the years 2009 and 2008 to prior years, therefore the tax cash benefits from share-based compensation in those years was determined to be received in 2010. In addition, refunds related to the carryback of 2008 net operating loss to prior years were also received in 2009. As refunds could not be specifically determined as to which related to share-based compensation, it was assumed these cash flows were received in 2010 as most refunds were received in that year.