Derivative Instruments and Hedging Activities - Offsetting of Derivative Assets and Liabilities in the Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Derivative assets
Gross amounts of recognized assets	$ 2,668	$ 0
Gross amounts offset in the statement of financial position	1,006	0
Net amounts of assets presented in the statement of financial position	1,662	0
Gross amounts of financial instruments not offset in the statement of financial position	0	0
Net amount	1,662	0
Derivative liabilities
Gross amounts of recognized liabilities	7,159	0
Gross amounts offset in the statement of financial position	(1,006)	0
Net amounts of liabilities presented in the statement of financial position	6,153	0
Gross amounts of financial instruments not offset in the statement of financial position	0	0
Net amount	$ 6,153	$ 0