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Stockholders' Equity (Details Textual) (USD $)
 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Feb. 29, 2012
Dec. 31, 2011
Y
Dec. 31, 2010
Dec. 31, 2009
Jan. 31, 2012
Dec. 31, 2008
Feb. 28, 2011
2005 Contingent stock plan [Member]
Dec. 31, 2011
2005 Contingent stock plan [Member]
Dec. 31, 2010
2005 Contingent stock plan [Member]
Dec. 31, 2009
2005 Contingent stock plan [Member]
Dec. 31, 2011
2002 Directors Stock Plan [Member]
Dec. 31, 2010
2002 Directors Stock Plan [Member]
Dec. 31, 2009
2002 Directors Stock Plan [Member]
May 31, 2011
2002 Directors Stock Plan amended [Member]
Dec. 31, 2011
PSU awards [Member]
Dec. 31, 2011
2011 Three-year PSU Awards [Member]
Mar. 11, 2011
2011 Three-year PSU Awards [Member]
Dec. 31, 2011
2011 Three-year PSU Awards [Member]
Maximum [Member]
Dec. 31, 2011
2011 Three-year PSU Awards [Member]
Minimum [Member]
Dec. 31, 2011
2010 Three-year PSU Awards [Member]
Mar. 08, 2011
2010 Three-year PSU Awards [Member]
Dec. 31, 2011
2010 Three-year PSU Awards [Member]
Maximum [Member]
Dec. 31, 2011
2010 Three-year PSU Awards [Member]
Minimum [Member]
Dec. 31, 2011
2009 Three-year PSU Awards [Member]
Mar. 08, 2010
2009 Three-year PSU Awards [Member]
Dec. 31, 2011
2009 Three-year PSU Awards [Member]
Maximum [Member]
Dec. 31, 2011
2009 Three-year PSU Awards [Member]
Minimum [Member]
Feb. 28, 2011
2009 Two-year PSU Awards [Member]
Dec. 31, 2011
2009 Two-year PSU Awards [Member]
Dec. 31, 2011
SLO Awards [Member]
Dec. 31, 2010
SLO Awards [Member]
Stockholders' Equity (Textual) [Abstract]                                                              
Number of shares of common stock reserved for issuance                           400,000                                  
Increase number of shares of common stock reserved for issuance under the plan                     200,000                                        
Dividends accrued in other current liabilities                             $ 2,600,000                                
Targeted number of common stock shares to be earned under the performance incentive plan                               384,714       416,160       578,432              
Increase or decrease in the number of shares earned for each participant based on the performance                               up to 10% of target level       up to 10% of target level       up to 10% of target level              
Aggregate increase or decrease in the number of shares earned for all participants based on the performance                               38,471       41,616       57,843              
Recordable incident rate to be achieved under additional goal                               1.20 or better       1.20 or better       1.30 or better              
Shares to be issued as a percentage of target shares under the performance incentive plan                                   200.00% 0.00%     200.00% 0.00%     200.00% 0.00%        
Per share price of common stock               $ 24.93 $ 21.46 $ 16.33 $ 25.77 $ 21.72 $ 19.34       $ 26.18       $ 20.88       $ 20.88            
Target level for the determination of performance goals and measures                               100.00%       100.00%                      
Maximum level for the determination of performance goals and measures                                       200.00%       200.00%              
Targeted number of common stock shares to be earned under the performance incentive plan at ROIC target level                               192,357       208,080                      
Shares at maximum level, net of forfeitures                                               1,156,865              
Share price related to additional goals                                               $ 17.21              
Shares of common stock issued for the 2009 two-year PSU awards                                                       1,114,139 1,114,139    
Acquired stock under 2005 contingent stock plan             408,751                                                
Shares Withheld for Minimum Tax Obligation in Treasury Stock at Fair Value               12,000,000                                              
Incremental in annual cash bonus                                                           25.00%  
Share based compensation stock award premium                                                           25.00% 25.00%
Restricted stock shares and restricted stock units included in SLO Award target                                                           77,926 34,596
Issuance of Additional Shares under Amended 2005 Contingent Stock Plan   3                                                          
Liabilities related to Cash awards   500,000                                                          
Targeted number of common stock shares to be earned under performance incentive plan at volume target level                               142,344       416,160                      
Percentage targeted number of common stock shares net of forfeiture related to volume goal                               74.00%                              
Additional Stockholders' Equity (Textual) [Abstract]                                                              
Dividends declared per common share $ 0.13                                                            
Estimated dividend payment   25,000,000                                                          
Common stock issued   202,528,616 169,272,636 168,749,681 192,000,000 168,111,815                                                  
Common stock outstanding   192,062,185 159,305,507   192,000,000                                                    
Weighted average remaining contractual life of non vested restricted stock shares   1.3                                                          
Weighted average remaining contractual life of non vested restricted stock units   1.5                                                          
Weighted average remaining contractual life of non vested cash awards   1.7                                                          
Excess of fair value over share issue price   700,000 500,000 500,000                                                      
Period in the beginning of each year to award Performance Share Unit   90 days                                                          
Dividends paid per common share   $ 0.52 $ 0.50 $ 0.48                                                      
Cash dividend paid of current quarter in available cash   $ 87,400,000 $ 79,700,000 $ 75,700,000