Fair Value Measurements - Summary of Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Financial assets
Current derivative assets	$ 2,460	$ 3,694
Noncurrent derivative assets	7
Fair Value on a Recurring Basis [Member]
Financial assets
Current derivative assets	2,460	3,694
Noncurrent derivative assets	7
Net Recognized Assets	2,467	3,694
Fair Value on a Recurring Basis [Member] | Level 2 [Member]
Financial assets
Current derivative assets	2,460	3,694
Noncurrent derivative assets	7
Net Recognized Assets	$ 2,467	$ 3,694