Derivatives and Hedging Activities (Details Textual) € in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)	Mar. 17, 2015 EUR (€)	Dec. 31, 2014 USD ($)
Foreign Exchange Forward
Derivative [Line Items]
Derivative, Lower Remaining Maturity Range	6 days
Derivative, Upper Remaining Maturity Range	25 months
Interest Rate Swap Agreements
Derivative [Line Items]
Derivative, notional amount	$ 0
Designated as Hedging Instrument | Foreign Exchange Forward
Derivative [Line Items]
Derivative, notional amount	21,000,000		$ 125,900,000
Designated as Hedging Instrument | Interest Rate Swap Agreements
Derivative [Line Items]
Derivative, notional amount			40,000,000
Not Designated as a Hedging Instrument | Foreign Exchange Forward
Derivative [Line Items]
Derivative, notional amount	$ 376,300,000		$ 421,100,000
2022 EUR Senior notes
Derivative [Line Items]
Designated Amount, Net Investment Hedge | €		€ 255.7
Debt Instrument, Face Amount | €		€ 500.0