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Stock-based Compensation and Awards (Details Textual) (USD $)
 12 Months Ended 30 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Dec. 31, 2011
2007 Plan [Member]
Dec. 31, 2010
2007 Plan [Member]
Dec. 31, 2009
2007 Plan [Member]
May 31, 2010
2007 Plan [Member]
Aug. 20, 2007
2007 Plan [Member]
Dec. 31, 2011
Restricted Stock and Restricted Stock Units [Member]
Y
Dec. 31, 2011
Phantom Units [Member]
Y
Dec. 31, 2011
Employee Stock Option [Member]
Y
May 31, 2011
Employee Stock Option [Member]
Dec. 31, 2011
Partnership Long-Term Incentive Plan [Member]
Dec. 31, 2011
Director's Stock and Deferral Plan [Member]
Aug. 20, 2007
Director's Stock and Deferral Plan [Member]
Dec. 31, 2011
Employment Inducement Plan [Member]
Oct. 31, 2011
Employment Inducement Plan [Member]
Dec. 31, 2011
On settlement of employee stock purchase plan shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                      
Percentage of Employee stock purchase plan                                     10.00%
Amount for Employee stock purchase plan                                     $ 25,000,000
Percentage of ESPP fair value Minimum                                     85.00%
Percentage of ESPP fair value Maximum                                     100.00%
Number of shares authorized and reserved for issuance               9,750,000 12,500,000       1,000,000 1,035,378   100,000   1,000,000  
Share based compensation by stock option expiration period         no later than seven years                            
Share based compensation by stock option vesting method                                       
Weighted average fair value at date of grant         $ 5.81 $ 8.71 $ 5.87                        
Unrecognized compensation cost on Stock Options                   21,100,000 1,400,000 5,200,000              
Unrecognized compensation cost is expected to be recognized over a weighted average period                   2.0 1.8 2.0              
Shares remained available for purchase under ESPP                             69,629   539,982   491,533
Units granted to officers and directors                   1,212,000 49,082                
Stock-Based Compensation (Textual) [Abstract]                                      
Intrinsic value of stock options exercised $ 200,000 $ 500,000 $ 0                                
Employee Stock Purchase plan discount from market price       5.00%                              
Stock Incentive Plan Description Each option and stock appreciation right granted counts as one share against the aggregate share limit, and each share of restricted stock and restricted stock unit granted counts as two shares against the aggregate share limit. Awards granted under the 2007 Plan that are subsequently cancelled, terminated or forfeited are available for future grant.                                    
Percentage of award vesting on each anniversaries 33.33%