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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 |  |

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- Definition Gross amount, as of the balance sheet date, of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings in periods after one year or beyond the normal operating cycle, if longer, over the life of the long-term debt instruments to which such costs pertain. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Line-of-Credit Arrangement -URI http://asc.fasb.org/extlink&oid=6517033 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6743817&loc=d3e1314-112600 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=6743817&loc=d3e1336-112600 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 6 -Paragraph 9, 10, 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
Name: | us-gaap_WriteOffOfDeferredDebtIssuanceCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration