Derivative Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Recurring - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Assets:
Derivative assets	$ 1,588	$ 1,087
Liabilities:
Derivative liabilities	267	57
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Derivative assets	0	0
Liabilities:
Derivative liabilities	0	0
Significant Observable Inputs (Level 2)
Assets:
Derivative assets	1,588	1,087
Liabilities:
Derivative liabilities	267	57
Significant Unobservable Inputs (Level 3)
Assets:
Derivative assets	0	0
Liabilities:
Derivative liabilities	0	0
Forward Currency Contracts
Assets:
Derivative assets	0	26
Liabilities:
Derivative liabilities	267	57
Forward Currency Contracts | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Derivative assets	0	0
Liabilities:
Derivative liabilities	0	0
Forward Currency Contracts | Significant Observable Inputs (Level 2)
Assets:
Derivative assets	0	26
Liabilities:
Derivative liabilities	267	57
Forward Currency Contracts | Significant Unobservable Inputs (Level 3)
Assets:
Derivative assets	0	0
Liabilities:
Derivative liabilities	0	0
Interest Rate Swaps
Assets:
Derivative assets	1,588	1,061
Interest Rate Swaps | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Derivative assets	0	0
Interest Rate Swaps | Significant Observable Inputs (Level 2)
Assets:
Derivative assets	1,588	1,061
Interest Rate Swaps | Significant Unobservable Inputs (Level 3)
Assets:
Derivative assets	$ 0	$ 0