Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fair value assets and liabilities measured on recurring basis:
Exercise of warrants classified as Level 3 within the fair value hierarchy in exchange for marketable equity securities classified as Level 1	$ 2,000
Fair value on a recurring basis | Level 1
Fair value assets and liabilities measured on recurring basis:
Marketable equity securities	39
Fair value on a recurring basis | Level 2 | Interest-rate swap contracts
Fair value assets and liabilities measured on recurring basis:
Derivative assets	196
Derivative liabilities	(6,251)
Fair value on a recurring basis | Level 2 | Currency Swap
Fair value assets and liabilities measured on recurring basis:
Derivative assets	1,551
Fair value on a recurring basis | Level 3 | Warrants
Fair value assets and liabilities measured on recurring basis:
Derivative assets	55
Fair Value | Level 1
Fair value assets and liabilities measured on recurring basis:
Marketable equity securities	39	$ 43
Fair Value | Level 2 | Interest-rate swap contracts
Fair value assets and liabilities measured on recurring basis:
Derivative assets	196	178
Derivative liabilities	6,251	7,663
Fair Value | Level 2 | Currency Swap
Fair value assets and liabilities measured on recurring basis:
Derivative assets	1,551	929
Fair Value | Level 3 | Warrants
Fair value assets and liabilities measured on recurring basis:
Derivative assets	55	$ 2,220
Fair Value | Fair value on a recurring basis
Fair value assets and liabilities measured on recurring basis:
Marketable equity securities	39
Fair Value | Fair value on a recurring basis | Interest-rate swap contracts
Fair value assets and liabilities measured on recurring basis:
Derivative assets	196
Derivative liabilities	(6,251)
Fair Value | Fair value on a recurring basis | Currency Swap
Fair value assets and liabilities measured on recurring basis:
Derivative assets	1,551
Fair Value | Fair value on a recurring basis | Warrants
Fair value assets and liabilities measured on recurring basis:
Derivative assets	$ 55