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Long-Term Debt (Net Interest Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Debt Disclosure [Abstract]
Interest expense	$ 8,409us-gaap_InterestExpense	$ 8,362us-gaap_InterestExpense
Interest income	(650)us-gaap_InterestIncomeOther	(717)us-gaap_InterestIncomeOther
Capitalized interest	(3,689)us-gaap_InterestCostsCapitalized	(3,162)us-gaap_InterestCostsCapitalized
Net interest expense	$ 4,070us-gaap_InterestIncomeExpenseNonoperatingNet	$ 4,483us-gaap_InterestIncomeExpenseNonoperatingNet

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- Details

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Balance Type:	na
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X

- 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

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Balance Type:	debit
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- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.9)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 9

-Article 9

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Balance Type:	debit
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- Definition

The net amount of nonoperating interest income (expense).

+ References

No definition available.

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- Definition

Amount of interest income earned from interest bearing assets not separately disclosed.

+ References

No definition available.

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