Fair Value Measurements (Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	$ 6,506	$ 16
Interest rate swaps	405	334
Total liabilities	405	334
Non domestic bank certificates of deposit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Term deposits	6,506	16
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	6,506	16
Interest rate swaps	0	0
Total liabilities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Non domestic bank certificates of deposit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Term deposits	6,506	16
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	0	0
Interest rate swaps	405	334
Total liabilities	405	334
Significant Other Observable Inputs (Level 2) | Non domestic bank certificates of deposit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Term deposits	0	0
Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	0	0
Interest rate swaps	0	0
Total liabilities	0	0
Significant Unobservable Inputs (Level 3) | Non domestic bank certificates of deposit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Term deposits	$ 0	$ 0