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Derivative Financial Instruments and Hedging Activities - Narrative (Details) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative [Line Items]
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax		$ (10,026,000)	$ (6,310,000)
Derivative, Description of Variable Rate Basis	one-month LIBOR
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax		10,800,000	9,900,000
Other Comprehensive Income (Loss), Tax		700,000	3,600,000
Gain (loss) on debt redemption		(8,681,000)	(2,167,000)	3,651,000
Scenario, Forecast [Member]
Derivative [Line Items]
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax		$ 1,600,000

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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