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COMPENSATION PLANS (Details) (USD $)
12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 36 Months Ended 0 Months Ended 39 Months Ended 36 Months Ended 0 Months Ended 36 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2011
Feb. 15, 2013
ARLP LTIP
Feb. 14, 2012
ARLP LTIP
Dec. 31, 2012
ARLP LTIP
Dec. 31, 2011
ARLP LTIP
Dec. 31, 2010
ARLP LTIP
Jan. 23, 2013
ARLP LTIP
Phantom Share Units (PSUs)
Dec. 31, 2012
ARLP LTIP
Phantom Share Units (PSUs)
Dec. 31, 2011
ARLP LTIP
Phantom Share Units (PSUs)
Dec. 31, 2010
ARLP LTIP
Phantom Share Units (PSUs)
Jan. 02, 2012
ARLP LTIP, 2009 Grants
Phantom Share Units (PSUs)
Dec. 31, 2011
ARLP LTIP, 2009 Grants
Phantom Share Units (PSUs)
Jan. 02, 2012
ARLP LTIP, 2008 Q4 Grants
Phantom Share Units (PSUs)
Dec. 31, 2011
ARLP LTIP, 2008 Q4 Grants
Phantom Share Units (PSUs)
Dec. 31, 2012
ARLP LTIP, 2010, 2011 and 2012 Grants
Phantom Share Units (PSUs)
Jan. 02, 2013
ARLP LTIP, 2010 Grants
Phantom Share Units (PSUs)
Dec. 31, 2012
ARLP LTIP, 2010 Grants
Phantom Share Units (PSUs)
Dec. 31, 2012
AHGP LTIP
Dec. 31, 2012
SERP and Deferred Compensation Plans
Dec. 31, 2011
SERP and Deferred Compensation Plans
Dec. 31, 2010
SERP and Deferred Compensation Plans
Dec. 31, 2012
SERP and Deferred Compensation Plans
Phantom Share Units (PSUs)
Jan. 02, 2011
SERP And MGP Deferred Compensation Plan
Dec. 31, 2012
SERP And MGP Deferred Compensation Plan
Dec. 31, 2012
SERP And MGP Deferred Compensation Plan
Phantom Share Units (PSUs)
Dec. 31, 2011
SERP And MGP Deferred Compensation Plan
Phantom Share Units (PSUs)
Jan. 02, 2011
AGP Deferred Compensation Plan
Dec. 31, 2012
AGP Deferred Compensation Plan
Dec. 31, 2012
AGP Deferred Compensation Plan
Phantom Share Units (PSUs)
Dec. 31, 2011
AGP Deferred Compensation Plan
Phantom Share Units (PSUs)
Feb. 15, 2013
MGP Deferred Compensation Plan
Compensation Plans                                                              
Shares available for grant units for which vesting requirements were deemed satisfied               144,430     9,125   135,305     130,102                              
Common units issued upon vesting   82,400 93,938                                                       5,705
Additional common units granted             146,725 107,114 108,416 138,130                             13,791 13,725     3,867 3,756  
Additional grants authorized (in shares)             156,575                                                
Share based compensation expense       $ 6,400,000 $ 5,300,000 $ 4,100,000                         $ 1,000,000 $ 1,200,000 $ 4,300,000                    
Fair value as intrinsic value at date of grant (in dollars per unit)               $ 77.71 $ 66.84 $ 39.59                             $ 60.91 $ 72.83     $ 46.55 $ 48.53  
Shares available for grant       2,200,000                                                      
Unrecognized compensation expense       7,800,000                                                      
Weighted-average period for recognition of expense       1 year 6 months                                                      
Intrinsic value of outstanding grants               19,800,000                           10,000,000                  
Total share based obligation recorded       12,100,000 9,600,000                                     10,700,000       600,000      
Units reserved for issuance under the LTIP                                   5,215,000                          
Reclassification of deferred compensation obligations to partners' capital $ 9,905,000                                           $ 9,200,000       $ 700,000        
Grants outstanding (in shares)               340,878 384,218                         175,241                  
Summary of non-vested LTIP grants                                                              
Balance at the beginning of the period (in shares)               384,218                           175,241                  
Granted (in shares)             146,725 107,114 108,416 138,130                             13,791 13,725     3,867 3,756  
Vested (in shares)               (144,430)     (9,125)   (135,305)     (130,102)                              
Forfeited (in shares)               (6,024)       (500)   (5,840) (12,782)   (8,028)                            
Balance at the end of the period (in shares)               340,878 384,218                         175,241