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Debt (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Long-term portion [Abstract]      
Revolving Line of Credit, variable rate (described below) $ 147,300,000 $ 98,700,000  
Floating Rate Senior Notes (described below) 100,000,000 100,000,000  
Total long-term portion 247,300,000 198,700,000  
Unsecured syndicated senior credit facility [Abstract]      
Revolving credit facility, maximum borrowing capacity 430,000,000    
Revolving credit facility, term (in years) 5    
Maturity date of debt Oct. 16, 2016    
Potential increase in borrowing capacity 75,000,000    
Line of credit facility, amount outstanding 147,300,000    
Line of credit facility, remaining borrowing capacity 280,000,000    
Weighted average effective interest rate (in hundredths) 2200.00%    
Line of credit facility, interest rate description
Revolving borrowings under the Credit Facility bear interest, at our option, at either of the following and in each case plus an applicable margin:

a.  
a base rate, which is the highest of (i) the Wells Fargo Bank, National Association prime rate, (ii) the Federal Funds Rate plus 0.500% and (iii) the LIBOR Market Index Rate plus 1.000%; or
b.  
the London Interbank Offered Rate (LIBOR).

Borrowings by the Canadian Borrower bear interest, at the Canadian Borrower’s option, at either of the following and in each case plus an applicable margin:

a.  
a base rate, which is the greatest of (i) the Canadian Reference Bank prime rate, (ii) the annual rate of interest equal to the sum of the CDOR Rate plus 1.000% and (iii) the LIBOR Market Index Rate plus 1.000%; or
b.  
LIBOR.

Borrowings by the Dutch Borrower bear interest at LIBOR plus an applicable margin.

    
Annual facility fee, minimum (in hundredths) 0.15%    
Annual facility fee, maximum (in hundredths) 0.35%    
Floating rate senior notes [Abstract]      
Floating interest rate, spread over three-month LIBOR (in hundredths) 60.00%    
Weighted average effective interest rate (in hundredths) 330.00%    
Interest rate swap [Abstract]      
Number of previously terminated interest rate swap agreements for Term Loan 2    
Incremental interest expense arising from difference between interest paid and interest received related to swap agreements 3,600,000 4,000,000  
Estimated fair value (420,000) (3,349,000)  
Deferred financing costs [Abstract]      
Balance at beginning of year 2,172,000 2,027,000  
Financing costs deferred 1,674,000 145,000 305,000
Write-off fully amortized deferred financing costs (395,000) 0  
Balance at end of year 3,451,000 2,172,000 2,027,000
Accumulated amortization of deferred financing costs [Abstract]      
Balance at beginning of year 1,652,000 1,160,000  
Amortization of deferred financing costs (324,000) (492,000)  
Write-off fully amortized deferred financing costs 395,000 0  
Balance at end of year 1,581,000 1,652,000 1,160,000
Interest Rate Swap 1, Credit Facility [Member]
      
Interest rate swap [Abstract]      
Interest rate swap agreement, fixed interest rate (in hundredths) 118.50%    
Interest rate swap agreement, notional amount 25,000,000    
Interest rate swap agreement, effective date Nov. 21, 2011    
Interest rate swap agreement, termination date Oct. 19, 2016    
Interest Rate Swap 2, Credit Facility [Member]
      
Interest rate swap [Abstract]      
Interest rate swap agreement, fixed interest rate (in hundredths) 118.50%    
Interest rate swap agreement, notional amount 25,000,000    
Interest rate swap agreement, effective date Nov. 21, 2011    
Interest rate swap agreement, termination date Oct. 19, 2016    
Interest Rate Swap 3, Credit Facility [Member]
      
Interest rate swap [Abstract]      
Interest rate swap agreement, fixed interest rate (in hundredths) 110.00%    
Interest rate swap agreement, notional amount 50,000    
Interest rate swap agreement, effective date Dec. 21, 2011    
Interest rate swap agreement, termination date Oct. 19, 2016    
Interest Rate Swap, Previous Revolver [Member]
      
Interest rate swap [Abstract]      
Interest rate swap agreement, fixed interest rate (in hundredths) 172.50%    
Interest rate swap agreement, notional amount 50,000,000    
Interest rate swap agreement, effective date Jan. 27, 2010    
Interest rate swap agreement, termination date Jan. 27, 2012    
Interest Rate Swap, Floating Rate Senior Notes [Member]
      
Interest rate swap [Abstract]      
Interest rate swap agreement, fixed interest rate (in hundredths) 508.80%    
Interest rate swap agreement, notional amount $ 50,000,000    
Interest rate swap agreement, effective date Feb. 12, 2007    
Interest rate swap agreement, termination date Feb. 12, 2012