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Fair Value of Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2011
Fair Value of Financial Instruments [Abstract]  
Estimated fair value of financial instruments
                                 
    June 30, 2011   December 31, 2010
    Carrying   Estimated Fair   Carrying   Estimated Fair
    Amount   Value   Amount   Value
Assets:
                               
Cash and cash equivalents
  $ 191,432     $ 191,432     $ 299,169     $ 299,169  
Available-for-sale securities
    33,097       33,097       31,570       31,570  
Trading securities
    38,709       38,709       35,092       35,092  
Liabilities:
                               
Credit Facility
    5,974,321       5,806,274       5,999,337       5,882,124  
Senior notes
    2,784,331       2,846,978       2,784,331       2,923,548  
Other debt
    43,478       43,478       36,122       36,122  
Interest rate swaps
                                 
    Notional            
    Amount   Fixed Interest   Termination   Fair Value
Swap #   (in 000’s)   Rate   Date   (in 000’s)
1
  $ 300,000       5.1140 %   August 8, 2011   $ 1,533  
2
    100,000       4.7185 %   August 19, 2011     605  
3
    100,000       4.7040 %   August 19, 2011     603  
4
    100,000       4.6250 %   August 19, 2011     592  
5
    200,000       4.9300 %   August 30, 2011     1,551  
6
    200,000       3.0920 %   September 18, 2011     1,248  
7
    100,000       3.0230 %   October 23, 2011     869  
8
    200,000       4.4815 %   October 26, 2011     2,712  
9
    200,000       4.0840 %   December 3, 2011     3,279  
10
    100,000       3.8470 %   January 4, 2012     1,822  
11
    100,000       3.8510 %   January 4, 2012     1,824  
12
    100,000       3.8560 %   January 4, 2012     1,826  
13
    200,000       3.7260 %   January 8, 2012     3,610  
14
    200,000       3.5065 %   January 16, 2012     3,514  
15
    250,000       5.0185 %   May 30, 2012     10,654  
16
    150,000       5.0250 %   May 30, 2012     6,401  
17
    200,000       4.6845 %   September 11, 2012     10,208  
18
    100,000       3.3520 %   October 23, 2012     3,798  
19
    125,000       4.3745 %   November 23, 2012     6,794  
20
    75,000       4.3800 %   November 23, 2012     4,082  
21
    150,000       5.0200 %   November 30, 2012     9,618  
22
    200,000       2.2420 %   February 28, 2013     5,561  
23
    100,000       5.0230 %   May 30, 2013     8,262  
24
    300,000       5.2420 %   August 6, 2013     27,964  
25
    100,000       5.0380 %   August 30, 2013     9,101  
26
    50,000       3.5860 %   October 23, 2013     3,130  
27
    50,000       3.5240 %   October 23, 2013     3,063  
28
    100,000       5.0500 %   November 30, 2013     9,857  
29
    200,000       2.0700 %   December 19, 2013     5,715  
30
    100,000       5.2310 %   July 25, 2014     11,994  
31
    100,000       5.2310 %   July 25, 2014     11,998  
32
    200,000       5.1600 %   July 25, 2014     23,584  
33
    75,000       5.0405 %   July 25, 2014     8,571  
34
    125,000       5.0215 %   July 25, 2014     14,218  
35
    100,000       2.6210 %   July 25, 2014     4,349  
36
    100,000       3.1100 %   July 25, 2014     5,788  
37
    100,000       3.2580 %   July 25, 2014     6,222  
38
    200,000       2.6930 %   October 26, 2014     7,504  (1)
39
    300,000       3.4470 %   August 8, 2016     18,662  (2)
40
    200,000       3.4285 %   August 19, 2016     12,096  (3)
41
    100,000       3.4010 %   August 19, 2016     6,019  (4)
42
    200,000       3.5000 %   August 30, 2016     12,529  (5)
43
    100,000       3.0050 %   November 30, 2016     4,196  
 
(1)   This interest rate swap becomes effective October 26, 2011, concurrent with the termination of swap #8.
 
(2)   This interest rate swap becomes effective August 8, 2011, concurrent with the termination of swap #1.
 
(3)   This interest rate swap becomes effective August 19, 2011, concurrent with the termination of swaps #2 and #4.
 
(4)   This interest rate swap becomes effective August 19, 2011, concurrent with the termination of swap #3.
 
(5)   This interest rate swap becomes effective August 30, 2011, concurrent with the termination of swap #5.
Amount pf pre-tax loss recognized in the condensed consolidated balance sheets as a component of other comprehensive income
                                 
Derivatives in Cash Flow Hedging   Amount of Pre-Tax Loss Recognized in OCI on Derivative (Effective Portion)
Relationships   Three Months Ended June 30,   Six Months Ended June 30,
    2011   2010   2011   2010
Interest rate swaps
  $ (67,685 )   $ (107,656 )   $ (63,572 )   $ (178,564 )
Effective portion of the pre-tax loss reclassified from accumulated other comprehensive loss ("OCL") into interest expense on the condensed consolidated statements of income
                                 
Location of Loss Reclassified from    
AOCL into Income (Effective   Amount of Pre-Tax Loss Reclassified from AOCL into Income (Effective Portion)
Portion)   Three Months Ended June 30,   Six Months Ended June 30,
    2011   2010   2011   2010
Interest expense, net
  $ 53,649     $ 55,009     $ 106,573     $ 108,173  
Fair value of derivative instruments in the condensed consolidated balance sheets
                                                                   
    Asset Derivatives     Liability Derivatives
    June 30, 2011   December 31, 2010     June 30, 2011   December 31, 2010
    Balance           Balance             Balance           Balance    
    Sheet   Fair   Sheet   Fair     Sheet   Fair   Sheet   Fair
    Location   Value   Location   Value     Location   Value   Location   Value
Derivatives designated as hedging instruments
  Other assets, net   $ —     Other assets, net   $ —       Other
long-term
liabilities		   $ 297,526     Other
long-term
liabilities		   $ 340,526