Derivative Financial Instruments and Hedging Activities - Schedule of Changes in the Losses on Cash Flow Hedges Included in AOCL (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 10,151
Other	4	5	5
Ending balance	8,413	10,151
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	10,151	6,441	7,896
Additional net losses on cash flow hedges	0	12,363	8,315
Ineffectiveness of cash flow hedges reclassified to earnings	0	(657)	41
Losses on terminated hedging relationships amortized to earnings	(1,982)	(10,816)	(10,592)
Net increase (decrease) in accumulated losses on cash flow hedges	(1,982)	890	(2,236)
Decrease in deferred taxes on accumulated losses on cash flow hedges	248	2,825	786
Increase (decrease) in accumulated losses on cash flow hedges, net of taxes	(1,734)	3,715	(1,450)
Other	(4)	(5)	(5)
Ending balance	$ 8,413	$ 10,151	$ 6,441

Derivative Instruments, Gain (Loss) Recognized in Income, Gain (Loss) on Termination of Hedge

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

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-Publisher FASB

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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

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-Paragraph 4C

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The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

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- Definition

Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss), attributable to parent entity.

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Amount of tax expense (benefit), after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss), attributable to parent entity.

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Amount before tax, after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

+ References

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The change in other comprehensive income during the reporting period, net of tax, for an item that is not separately disclosed.

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