Debt Summary (Schedule of Interest Expense and Weighted Average Interest Rates) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Interest Expense: [Abstract]
Interest incurred	$ 13,322us-gaap_InterestCostsIncurred	$ 13,519us-gaap_InterestCostsIncurred
Amortization of deferred financing costs	547us-gaap_AmortizationOfFinancingCosts	528us-gaap_AmortizationOfFinancingCosts
Capitalized interest	(224)us-gaap_InterestCostsCapitalized	(59)us-gaap_InterestCostsCapitalized
Interest Expense	$ 13,645us-gaap_InterestExpense	$ 13,988us-gaap_InterestExpense
Senior Unsecured Credit Facility [Member] \| Line of Credit [Member]
Interest Expense: [Abstract]
Weighted Average Interest Rates for Variable Rate Debt	1.88%	1.87%
LHL Unsecured Credit Facility [Member] \| Line of Credit [Member]
Interest Expense: [Abstract]
Weighted Average Interest Rates for Variable Rate Debt	1.87%	1.91%
Massport Bonds [Member] \| Notes Payable, Other Payables [Member]
Interest Expense: [Abstract]
Weighted Average Interest Rates for Variable Rate Debt	0.04%	0.45%

Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense.

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The average effective interest rate during the reporting period.

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-Glossary Allowance for Funds Used during Construction

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Total interest costs incurred during the period and either capitalized or charged against earnings.

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

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