Fair Value Measurements - Summary of Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financial assets
Current derivative assets	$ 3,694	$ 3,569
Fair Value on a Recurring Basis [Member]
Financial assets
Current derivative assets	3,694	3,569
Total financial assets	3,694	3,569
Fair Value on a Recurring Basis [Member] | Level 2 [Member]
Financial assets
Current derivative assets	3,694	3,569
Total financial assets	$ 3,694	$ 3,569