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Debt (Details Textual) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012
Debt (Textual) [Abstract] |  |
Offer and sale of various securities | $ 300,000 |
Debt Instrument, Basis Spread on Variable Rate | 1.25% |
Previous Unsecured Bank Credit Facility [Member] |  |
Debt (Textual) [Abstract] |  |
Expiry date for agreement | Dec. 19, 2011 |
Repayment of balance outstanding | 38,000 |
Current Unsecured Bank Credit Facility [Member] |  |
Debt (Textual) [Abstract] |  |
Unsecured borrowings | 150,000 |
Expiry date for agreement | Oct. 06, 2015 |
Effective interest rate | 1.49% |
Current borrowing under the Current Bank Credit Facility | 38,000 |
Variable commitment fee unused portion | 0.15% |
Senior Notes 2015 [Member] |  |
Debt (Textual) [Abstract] |  |
Unaccrued discount | 38 | 65
Senior Notes | 6.05% |
Aggregate principal amount | 75,000 |
Maturity date of Senior note | Jun. 15, 2015 |
Discount on issue | 0.357% |
Effective yield | 6.098% |
Percentage of principal amount of senior notes for redemption | 100.00% |
Treasury yield basis point | 30 basis points |
Senior Notes 2016 [Member] |  |
Debt (Textual) [Abstract] |  |
Unaccrued discount | 88 | 126
Senior Notes | 6.85% |
Aggregate principal amount | $ 125,000 |
Maturity date of Senior note | Apr. 15, 2016 |
Discount on issue | 0.305% |
Effective yield | 6.893% |
Percentage of principal amount of senior notes for redemption | 100.00% |
Treasury yield basis point | 30 basis points |

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- Definition Maximum amount covered under universal shelf registration for additional capital borrowings. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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