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Debt (Narrative) (Details) (USD $)
3 Months Ended 5 Months Ended 12 Months Ended 5 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 24 Months Ended 3 Months Ended 5 Months Ended
Mar. 31, 2011
Dec. 31, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Maximum [Member]
Dec. 31, 2011
Minimum [Member]
Dec. 31, 2011
Credit Facility [Member]
Jun. 30, 2009
Previous Line Of Credit [Member]
Dec. 31, 2011
Previous Line Of Credit [Member]
Dec. 31, 2011
7.625% Senior Notes [Member]
Dec. 31, 2010
7.625% Senior Notes [Member]
Dec. 31, 2011
New 4.0% Notes [Member]
Dec. 31, 2011
New 4.25% Notes [Member]
Jun. 30, 2009
Original 4.0% Notes [Member]
Mar. 31, 2011
Original 4.0% Notes [Member]
Jun. 30, 2009
Original 4.0% Notes [Member]
Dec. 31, 2011
Original 4.0% Notes [Member]
Dec. 31, 2010
Original 4.0% Notes [Member]
Dec. 31, 2009
Original 4.0% Notes [Member]
Nov. 30, 2009
Original 4.25% Notes [Member]
Mar. 31, 2011
Original 4.25% Notes [Member]
Dec. 31, 2009
Original 4.25% Notes [Member]
Dec. 31, 2011
Original 4.25% Notes [Member]
Dec. 31, 2010
Original 4.25% Notes [Member]
Oct. 31, 2010
7.05% Equipment Term Loan [Member]
Dec. 31, 2011
7.05% Equipment Term Loan [Member]
Dec. 31, 2011
3.5267% Equipment Term Loan [Member]
Dec. 31, 2010
3.5267% Equipment Term Loan [Member]
Oct. 31, 2010
3.5267% Equipment Term Loan [Member]
Jun. 30, 2009
8% Convertible Note [Member]
Dec. 31, 2011
8% Convertible Note [Member]
Dec. 31, 2008
8% Convertible Note [Member]
Dec. 31, 2011
Capital Lease [Member]
Dec. 31, 2010
Capital Lease [Member]
Dec. 31, 2011
Notes Payable [Member]
Dec. 31, 2010
Notes Payable [Member]
Dec. 31, 2011
Total Remaining Original Senior Convertible Notes [Member]
Mar. 31, 2011
Total Exchanged Senior Convertible Notes [Member]
Dec. 31, 2010
Total Exchanged Senior Convertible Notes [Member]
Dec. 31, 2011
Total Exchanged Senior Convertible Notes [Member]
Dec. 31, 2011
Precision [Member]
Nov. 30, 2009
Precision [Member]
Jun. 30, 2011
2011 Acquisitions [Member]
Dec. 31, 2011
2011 Acquisitions [Member]
Dec. 31, 2011
Financial Standby Letter of Credit [Member]
Dec. 31, 2010
Financial Standby Letter of Credit [Member]
Dec. 31, 2011
Financial Standby Letter of Credit [Member]
Credit Facility [Member]
Maximum [Member]
Dec. 31, 2011
Financial Standby Letter of Credit [Member]
Credit Facility [Member]
Minimum [Member]
Dec. 31, 2011
Performance Guarantee [Member]
Credit Facility [Member]
Maximum [Member]
Dec. 31, 2011
Performance Guarantee [Member]
Credit Facility [Member]
Minimum [Member]
Dec. 31, 2011
Standby Letters Of Credit [Member]
Dec. 31, 2010
Standby Letters Of Credit [Member]
Maximum amount of available borrowing capacity               $ 600,000,000   $ 260,000,000                                                                                      
Line of credit facility, expiration date     August 22, 2016             May 2013                                                                                      
Optional increase in line of credit borrowing capacity   200,000,000 200,000,000                                                                                                    
Fixed charge coverage ratio                     2:1                                                                                    
Availability of credit facility   450,000,000 450,000,000                                                                             11,500,000                      
Line of credit facility, capacity available for issuance of letters of credit   350,000,000 350,000,000                                                                                                    
Debt instrument exchanged amount                               105,300,000           97,000,000                                 202,300,000                            
Insurance carriers letters of credit, amount outstanding                                                                                           90,000,000 85,800,000         51,400,000 59,500,000
Outstanding principal balance                         105,322,000 97,000,000 [1] 115,000,000   115,000,000 9,700,000 [2] 115,000,000 [2] 115,000,000 [2] 100,000,000   100,000,000 [2] 3,000,000 [2] 100,000,000 [2]   22,500,000     13,500,000     55,000,000         12,700,000                              
Credit Facility, minimum remaining liquidity provision   50,000,000 50,000,000                                                                                                    
Debt instrument interest rate, stated percentage                     7.625%   4.00% 4.25%       4.00%           4.25%     7.05% 3.5267%                                                  
Line of credit collateral     The Credit Facility is guaranteed by most of the Company's U.S. subsidiaries, and it is collateralized by a first priority security interest in substantially all of the Company's assets and the assets of its wholly-owned subsidiaries and a pledge of the outstanding equity interests in certain of the Company's operating subsidiaries.                                                                                                    
Credit Facility, interest rate description     Following the date on which the Company delivers its financial information to the lenders for the quarter ending March 31, 2012 (the "Interest Adjustment Date"), amounts borrowed under the Credit Facility will bear interest, at the Company's option, at a rate equal to either (a) the eurocurrency rate (as defined in the Credit Facility), plus a margin of 1.50% to 2.50%, as determined based on the Company's consolidated leverage ratio (as defined in the Credit Facility) as of the most recent fiscal quarter, or (b) the base rate, which is equal to the highest of (i) the federal funds rate (as defined in the Credit Facility) plus 0.5%, (ii) Bank of America's prime rate and (iii) the eurocurrency rate plus 1.00%, plus a margin of 0.50% to 1.50%, as determined based on the Company's consolidated leverage ratio as of the most recent fiscal quarter. Prior to the Interest Adjustment Date, the margin for eurocurrency rate loans will be fixed at 2.00%, and the margin for base rate loans will be fixed at 1.00%.                                                                                                    
Debt instrument, convertible, terms of conversion feature                                                                                                        
Letter of credit issued                                                                                           90,000,000 85,800,000         51,400,000 59,500,000
Unused credit facility fee     0.35%     0.45% 0.25%                                                                                            
Unused credit facility fee   0.35%                                                                                                      
Letter of credit fee percentage prior to adjustment date           2.00% 1.00%                                                                                            
Debt Instrument Exchanged Notes Exchange Fee 50 basis points, or 0.5%                                                                                                        
Exchange Fees incurred for debt conversion                                                                             1,000,000                            
Transaction costs incurred for debt conversion     6,589,000 169,000 9,079,000                                                                     500,000 700,000                        
Long-term debt   494,900,000 494,900,000 412,600,000       60,000,000     150,000,000 150,000,000 98,200,000 89,900,000       9,700,000 115,000,000         3,000,000 100,000,000     8,300,000 12,900,000         40,600,000 24,500,000 35,200,000 10,200,000               10,100,000                
Unamortized debt discount                         6,700,000 6,700,000                                                 17,400,000                            
Debt instrument interest rate effective percentage                                                                             6.73%                            
Debt Instrument, Restrictive Covenants              

The Credit Facility provides for a $600 million senior secured revolving credit facility maturing on August 22, 2016. Up to $350 million of the Credit Facility is available for the issuance of letters of credit. Subject to certain terms in the Credit Facility, the Company has the option to increase its revolving commitments and/or establish term loans of up to $200 million in total. Borrowings under the Credit Facility will be used to refinance existing indebtedness and for working capital, capital expenditures and other corporate purposes, including the repurchase or prepayment of indebtedness; however, the Credit Facility restricts the repurchase or prepayment of certain unsecured indebtedness, including the Company's senior notes due 2017 and senior convertible notes due 2014, unless the Company has at least $50 million of remaining liquidity (as defined in the Credit Facility) after any such repurchase or prepayment.

The Credit Facility requires that the Company maintain a consolidated leverage ratio (as defined in the Credit Facility) below 3.50 to 1.00 and a consolidated interest coverage ratio (as defined in the Credit Facility) above 3.00 to 1.00. Subject to customary exceptions, the Credit Facility also limits the Company's ability to engage in certain activities, including acquisitions, mergers and consolidations, debt incurrence, investments, capital expenditures, asset sales, debt prepayments, lien incurrence and the making of distributions on or repurchases of capital stock.

    If the fixed charge coverage ratio is less than 2:1, the Company is still permitted to incur the following additional indebtedness, among others: credit facilities under a defined threshold, renewals to existing debt permitted under the indenture, capital lease obligations up to 5% of the Company's consolidated net assets, plus an additional $50 million of indebtedness at any time the senior notes remain outstanding.                                                                                    
Debt maturity date               Aug. 22, 2016     Feb. 28, 2017             Jun. 15, 2014           Dec. 15, 2014     Dec. 31, 2013 Dec. 31, 2013       Dec. 31, 2013                                          
Debt repayment terms, monthly installments                                                     60 monthly 36 monthly                                                  
Conversion price                         $ 15.76 $ 15.48 $ 15.76   $ 15.76       $ 15.48                   $ 12.00   $ 12                                        
Repayments of debt                 20,000,000                                 13,400,000         55,000,000                                            
Debt assumed                                                                                   34,000,000   26,000,000                  
Debt instrument, covenant compliance                                                                                                        
Debt related to acquisitions                                                                                     33,600,000                    
Lease conversions from operating to capital     23,366,000                                                                                                    
Shares per stated principal amount                             63.4417           64.6162                                                                
Per principal amount for share conversion ratio                             1,000           1,000                                                                
Financing costs                                 5,400,000           3,700,000                                                            
Credit facility amount outstanding   60,000,000 60,000,000                                                                                                    
Accretion Expense     4,200,000                                                                                                    
Investor fee     4,200,000                                                                                                    
Letter of Credit Fee Percentage           2.00% 1.00%                                                                                 2.50% 1.50% 1.25% 0.75%    
Assumed debt immediately repaid                                                                                       $ 12,100,000                  
[1] Diluted shares associated with the New Notes are attributable to the premium over the respective conversion prices.
[2] Diluted shares associated with the Original Notes are attributable to the underlying principal amounts.