Derivative Instruments and Hedging Activities - Open Interest Rate Swap Contracts (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Cash Flow Hedging | Interest Rate Swap, May 2018 To May 2021 [Member]
Derivative [Line Items]
Notional Amounts (in U.S. dollars)		$ 25,000	$ 25,000
Net Unrealized Gain (Loss)		(67)	397
Cash Flow Hedging | Interest Rate Swap, September 2018 To September 2019 [Member]
Derivative [Line Items]
Notional Amounts (in U.S. dollars)		0	250,000
Net Unrealized Gain (Loss)		0	(163)
Cash Flow Hedging | Interest Rate Swap, September 2019 To September 2023 [Member]
Derivative [Line Items]
Notional Amounts (in U.S. dollars)		150,000	150,000
Net Unrealized Gain (Loss)		(7,696)	(2,899)
Cash Flow Hedging | Interest Rate Swap, May 2019 To May 2020 [Member] [Member]
Derivative [Line Items]
Notional Amounts (in U.S. dollars)		100,000
Net Unrealized Gain (Loss)		(237)
Cash Flow Hedging | Interest Rate Swap
Derivative [Line Items]
Notional Amounts (in U.S. dollars)		275,000	425,000
Net Unrealized Gain (Loss)		(8,000)	(2,665)
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Net Unrealized Gain (Loss)		(8,076)	463
Designated as Hedging Instrument [Member] | Interest Rate Swap
Derivative [Line Items]
Net Unrealized Gain (Loss)	[1]	$ (8,000)	$ (2,665)

[1] Assets are included in prepaid expenses and other and liabilities are included in other accrued expenses on the accompanying consolidated balance sheets.