Derivative Instruments and Hedging Activities - Offsetting of Derivative Assets and Liabilities in the Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Derivative Assets
Gross amounts of recognized assets	$ 18,994	$ 0
Gross amounts offset in the statement of financial position	0	0
Net amounts of assets presented in the statement of financial position	18,994	0
Gross amounts of financial instruments not offset in the statement of financial position	0	0
Net amount	$ 18,994	$ 0