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Organization And Significant Accounting Policies (Supplemental Cash Flow Information) (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Interest paid, including interest capitalized $ 34,977 $ 39,807
Income tax payments, net 79 705
Non-cash investing and financing activities:    
Dividends and distributions payable 13,639 11,448
Conversions of redeemable common units 591 527
Common stock 401k matching contribution 639 655
Construction cost accruals, increase (decrease) 4,033 (716)
Adjustments to equity related to redeemable common units, net $ (576) $ 170