Derivative Financial Instruments (Narrative) (Details)	12 Months Ended					12 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2013 EUR (€)	Dec. 31, 2010 USD ($)	Dec. 31, 2012 Term-B Facility [Member] USD ($)	Dec. 31, 2013 Interest Expense [Member] USD ($)	Dec. 31, 2012 Interest Expense [Member] USD ($)	Dec. 31, 2013 Interest Rate Swap [Member] USD ($)	Dec. 31, 2013 Foreign Exchange Option [Member] USD ($)	Dec. 31, 2013 Foreign Exchange Option [Member] EUR (€)	Dec. 31, 2013 Designated as Hedging Instrument [Member] Interest Rate Swap [Member] Cash Flow Hedging [Member] USD ($)	Dec. 31, 2013 Not Designated as Hedging Instrument [Member] Interest Rate Swap [Member] USD ($)
Derivative [Line Items]
Unrealized Gain (Loss) on Derivatives	$ 4,313,000	$ (8,739,000)	$ 0			$ (8,725,000)
Derivative, Notional Amount									700,250,000		125,000,000	500,250,000	200,000,000
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net							0	0
Gain (Loss) from Components Excluded from Assessment of Cash Flow Hedge Effectiveness, Net							0	0
Cash and cash equivalents	521,951,000	610,970,000	215,836,000	250,000,000	79,960,000
Prepaid Expense and Other Assets, Current	$ 65,512,000	$ 17,032,000								$ 2,577,000