Derivatives and Hedging Activities - Balance Sheet Location for Derivative Instrument (Details) - Designated as Hedging Instrument - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Interest rate swaps
Derivative [Line Items]
Notional Amount	$ 1,200,000
Fair Value Asset (Liability)	1,245	$ 1,879
Effective Date December 8, 2016
Derivative [Line Items]
Notional Amount	$ 500,000
Fixed Rate	1.825%
Fair Value Asset (Liability)	$ 2,770	$ 1,879
Effective Date January 31, 2017
Derivative [Line Items]
Notional Amount	$ 700,000
Fixed Rate	1.964%
Fair Value Asset (Liability)	$ (1,525)