Derivative Financial Instruments - Summary of Derivative Positions (Details) - 9 months ended Sep. 30, 2016	EUR (€) $ / € € / £ $ / £	USD ($) $ / € € / £ $ / £	GBP (£) $ / € € / £ $ / £
USD/EURO | Sell
Derivative [Line Items]
Notional Amount | €	€ 3,641,000
Weighted Average Remaining Maturity In Years	3 months
Average Exchange Rate | $ / €	1.13	1.13	1.13
USD/British Pound | Sell
Derivative [Line Items]
Notional Amount			£ 4,595,000
Weighted Average Remaining Maturity In Years	3 months
Average Exchange Rate | $ / £	1.30	1.30	1.30
EURO/British Pound | Sell
Derivative [Line Items]
Notional Amount			£ 8,000,000
Weighted Average Remaining Maturity In Years	3 months
Average Exchange Rate | € / £	0.87	0.87	0.87
Interest Rate Swaps
Derivative [Line Items]
Notional Amount | $		$ 249,375,000
Weighted Average Remaining Maturity In Years	4 years 1 month