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Debt (Details 2) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 period | Dec. 31, 2012 | Dec. 31, 2011
Schedule on basis of which debt matures |  |  |  |
2014 | $ 89,483,000 |  |  |
2015 | 395,969,000 | [1] |  |
2016 | 279,339,000 |  |  |
2017 | 405,615,000 | [2] |  |
2018 | 1,374,000 |  |  |
Thereafter | 763,938,000 |  |  |
Total | 1,935,718,000 | [3] |  |
Debt maturing in 2015 that may be extended for two one year periods | 250,000,000 |  |  |
Number Of Extension Option Periods For Year Two Long-term Debt Maturities Repayments of Principal | 2 |  |  |
Extension option period for portion of debt maturing in 2015 (in years) | 1 year |  |  |
Debt maturing in 2017 that may be extended for a one year period | 250,000,000 |  |  |
Extension option period for portion of debt maturing in 2017 (in years) | 1 year |  |  |
Net discounts | 8,000,000 |  |  |
Capitalized interest costs | $ 8,800,000 |  | $ 13,900,000 | $ 17,400,000
[1] | Includes $250.0 million that may be extended for two one-year periods at our option, subject to certain conditions.
[2] | ncludes $250.0 million that may be extended for one year at our option, subject to certain conditions.
[3] | Represents scheduled principal amortization and maturities only and therefore excludes net discounts of $8.0 million.

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- Definition Long-term Debt Maturities Repayments Of Principal in Year Four Amount Eligible for Optional Extension + References No definition available. + Details
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- Definition Represents the period over which a portion of the debt instruments which will mature in year four following the date of the latest balance sheet presented in the financial statements may be extended at the option of the entity, subject to certain conditions. + References No definition available. + Details
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- Definition Long-term Debt Maturities Repayments of Principal in Year Two Amount Eligible for Optional Extension + References No definition available. + Details
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- Definition Represents the period over which a portion of the debt instruments which will mature in year two following the date of the latest balance sheet presented in the financial statements may be extended at the option of the entity, subject to certain conditions. + References No definition available. + Details
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- Definition Represents the number of extension option periods pertaining to a portion of the debt instruments which will mature in year two following the date of the latest balance sheet presented in the financial statements that may be exercised at the option of the entity, subject to certain conditions. + References No definition available. + Details
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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition The amount of debt discount (net of debt premium) 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 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 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 835 -SubTopic 30 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28567-108399 Reference 4: 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 5: 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 of interest capitalized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Allowance for Funds Used during Construction -URI http://asc.fasb.org/extlink&oid=6504829 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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