Derivatives and Hedging (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2019
Interest Rate Derivatives
Notional value	$ 2,124,000,000		$ 2,124,000,000			$ 1,674,000,000
Unrealized Gain (Loss) on Cash Flow Hedging Instruments			(1,186,000)	$ 55,000
Unrealized gains (losses) included in accumulated other comprehensive loss	(82,600,000)		(82,600,000)			(19,500,000)
Amount of hedge ineffectiveness			0	0	$ 0
Reclassification of unrealized gain on discontinued cash flow hedges to interest expense	0	$ 0	0	(2,250,000)
Net unrealized gains in accumulated other comprehensive income expected to be reclassified into interest expense within the next 12 months	(27,800,000)		(27,800,000)
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net	(82,573,000)		(82,573,000)			(19,514,000)
Designated as Hedging Instrument | Interest Rate Swap, 1.15% [Member]
Interest Rate Derivatives
Notional value	100,000,000		100,000,000			100,000,000
Interest rate swap liability	$ (893,000)		$ (893,000)
Interest Rate Cash Flow Hedge Asset at Fair Value						607,000
Interest rate	1.15%		1.15%
Designated as Hedging Instrument | interest Rate Swap, 1.20%
Interest Rate Derivatives
Notional value	$ 100,000,000		$ 100,000,000			100,000,000
Interest rate swap liability	$ (938,000)		$ (938,000)
Interest Rate Cash Flow Hedge Asset at Fair Value						538,000
Interest rate	1.20%		1.20%
Designated as Hedging Instrument | Interest Rate Swap, 2.15%
Interest Rate Derivatives
Notional value	$ 75,000,000		$ 75,000,000			75,000,000
Interest rate swap liability	$ (1,347,000)		$ (1,347,000)			(590,000)
Interest rate	2.15%		2.15%
Designated as Hedging Instrument | Interest Rate Swap 1.91%
Interest Rate Derivatives
Notional value	$ 75,000,000		$ 75,000,000			75,000,000
Interest rate swap liability	$ (1,183,000)		$ (1,183,000)			(337,000)
Interest rate	1.91%		1.91%
Designated as Hedging Instrument | Interest Rate Swap, 1.61%
Interest Rate Derivatives
Notional value	$ 50,000,000		$ 50,000,000			50,000,000
Interest rate swap liability	$ (799,000)		$ (799,000)			(32,000)
Interest rate	1.61%		1.61%
Designated as Hedging Instrument | Interest Rate Swap, 1.56%
Interest Rate Derivatives
Notional value	$ 50,000,000		$ 50,000,000			50,000,000
Interest rate swap liability	$ (768,000)		$ (768,000)
Interest Rate Cash Flow Hedge Asset at Fair Value						13,000
Interest rate	1.56%		1.56%
Designated as Hedging Instrument | Interest Rate Swap, 1.71%
Interest Rate Derivatives
Notional value	$ 50,000,000		$ 50,000,000			50,000,000
Interest rate swap liability	$ (852,000)		$ (852,000)			(109,000)
Interest rate	1.71%		1.71%
Designated as Hedging Instrument | Interest Rate Swap, 2.29% [Member]
Interest Rate Derivatives
Notional value	$ 200,000,000		$ 200,000,000			200,000,000
Interest rate swap liability	$ (11,285,000)		$ (11,285,000)			(4,587,000)
Interest rate	2.29%		2.29%
Designated as Hedging Instrument | Interest Rate Swap, 2.290% [Member]
Interest Rate Derivatives
Notional value	$ 125,000,000		$ 125,000,000			125,000,000
Interest rate swap liability	$ (7,047,000)		$ (7,047,000)			(2,859,000)
Interest rate	2.29%		2.29%
Designated as Hedging Instrument | Interest Rate Swap, 2.38% [Member]
Interest Rate Derivatives
Notional value	$ 200,000,000		$ 200,000,000			200,000,000
Interest rate swap liability	$ (11,772,000)		$ (11,772,000)			(5,155,000)
Interest rate	2.38%		2.38%
Designated as Hedging Instrument | Interest Rate Swap, 2.380% [Member]
Interest Rate Derivatives
Notional value	$ 100,000,000		$ 100,000,000			100,000,000
Interest rate swap liability	$ (5,883,000)		$ (5,883,000)			(2,574,000)
Interest rate	2.38%		2.38%
Designated as Hedging Instrument | Interest Rate Swap, 2.75% [Member]
Interest Rate Derivatives
Notional value	$ 100,000,000		$ 100,000,000			100,000,000
Interest rate swap liability	$ (7,937,000)		$ (7,937,000)			(3,590,000)
Interest rate	2.75%		2.75%
Designated as Hedging Instrument | Interest Rate Swap, 2.51% [Member]
Interest Rate Derivatives
Notional value	$ 75,000,000		$ 75,000,000			75,000,000
Interest rate swap liability	$ (5,360,000)		$ (5,360,000)			(2,120,000)
Interest rate	2.51%		2.51%
Designated as Hedging Instrument | Interest Rate Swap, 2.39% [Member]
Interest Rate Derivatives
Notional value	$ 75,000,000		$ 75,000,000			75,000,000
Interest rate swap liability	$ (5,088,000)		$ (5,088,000)			(1,858,000)
Interest rate	2.39%		2.39%
Designated as Hedging Instrument | Interest Rate Swap, 1.35% [Member]
Interest Rate Derivatives
Notional value	$ 49,000,000		$ 49,000,000			49,000,000
Interest rate swap liability	$ (748,000)		$ (748,000)
Interest Rate Cash Flow Hedge Asset at Fair Value						181,000
Interest rate	1.35%		1.35%
Designated as Hedging Instrument | Interest Rate Swap, 1.28% [Member]
Interest Rate Derivatives
Notional value	$ 100,000,000		$ 100,000,000			100,000,000
Interest rate swap liability	$ (2,632,000)		$ (2,632,000)
Interest Rate Cash Flow Hedge Asset at Fair Value						690,000
Interest rate	1.28%		1.28%
Designated as Hedging Instrument | Interest Rate Swap, 1.24% [Member]
Interest Rate Derivatives
Notional value	$ 150,000,000		$ 150,000,000			150,000,000
Interest rate swap liability	$ (5,968,000)		$ (5,968,000)
Interest Rate Cash Flow Hedge Asset at Fair Value						2,268,000
Interest rate	1.24%		1.24%
Designated as Hedging Instrument | Interest Rate Swap, 1.16% [Member]
Interest Rate Derivatives
Notional value	$ 50,000,000		$ 50,000,000			0
Interest rate swap liability	$ (1,524,000)		$ (1,524,000)
Interest Rate Cash Flow Hedge Asset at Fair Value						0
Interest rate	1.16%		1.16%
Designated as Hedging Instrument | Interest Rate Swap, 1.200% [Member]
Interest Rate Derivatives
Notional value	$ 50,000,000		$ 50,000,000			0
Interest rate swap liability	$ (1,586,000)		$ (1,586,000)
Interest Rate Cash Flow Hedge Asset at Fair Value						0
Interest rate	1.20%		1.20%
Designated as Hedging Instrument | Interest Rate Swap, 1.150% [Member]
Interest Rate Derivatives
Notional value	$ 50,000,000		$ 50,000,000			0
Interest rate swap liability	$ (1,510,000)		$ (1,510,000)
Interest Rate Cash Flow Hedge Asset at Fair Value						0
Interest rate	1.15%		1.15%
Designated as Hedging Instrument | Interest Rate Swap, 1.10% [Member]
Interest Rate Derivatives
Notional value	$ 50,000,000		$ 50,000,000			0
Interest rate swap liability	$ (1,434,000)		$ (1,434,000)
Interest Rate Cash Flow Hedge Asset at Fair Value						0
Interest rate	1.10%		1.10%
Designated as Hedging Instrument | Interest Rate Swap, 0.98% [Member]
Interest Rate Derivatives
Notional value	$ 25,000,000		$ 25,000,000			0
Interest rate swap liability	$ (626,000)		$ (626,000)
Interest Rate Cash Flow Hedge Asset at Fair Value						0
Interest rate	0.98%		0.98%
Designated as Hedging Instrument | Interest Rate Swap, 0.95% [Member]
Interest Rate Derivatives
Notional value	$ 25,000,000		$ 25,000,000			0
Interest rate swap liability	$ (603,000)		$ (603,000)
Interest Rate Cash Flow Hedge Asset at Fair Value						0
Interest rate	0.95%		0.95%
Designated as Hedging Instrument | Interest Rate Swap, 0.93% [Member]
Interest Rate Derivatives
Notional value	$ 25,000,000		$ 25,000,000			0
Interest rate swap liability	$ (587,000)		$ (587,000)
Interest Rate Cash Flow Hedge Asset at Fair Value						0
Interest rate	0.93%		0.93%
Designated as Hedging Instrument | Interest Rate Swap, 0.90% [Member]
Interest Rate Derivatives
Notional value	$ 25,000,000		$ 25,000,000			0
Interest rate swap liability	$ (564,000)		$ (564,000)
Interest Rate Cash Flow Hedge Asset at Fair Value						0
Interest rate	0.90%		0.90%
Designated as Hedging Instrument | Interest Rate Swap, 0.85% [Member]
Interest Rate Derivatives
Notional value	$ 50,000,000		$ 50,000,000			0
Interest rate swap liability	$ (1,510,000)		$ (1,510,000)
Interest Rate Cash Flow Hedge Asset at Fair Value						0
Interest rate	0.85%		0.85%
Designated as Hedging Instrument | Interest Rate Swap, 0.75% [Member]
Interest Rate Derivatives
Notional value	$ 50,000,000		$ 50,000,000			0
Interest rate swap liability	$ (1,282,000)		$ (1,282,000)
Interest Rate Cash Flow Hedge Asset at Fair Value						0
Interest rate	0.75%		0.75%
Designated as Hedging Instrument | Interest Rate Swap, 0.65% [Member]
Interest Rate Derivatives
Notional value	$ 50,000,000		$ 50,000,000			0
Interest rate swap liability	$ (847,000)		$ (847,000)
Interest Rate Cash Flow Hedge Asset at Fair Value						0
Interest rate	0.65%		0.65%
Not Designated as Hedging Instrument
Interest Rate Derivatives
Notional value	$ 276,844,000		$ 276,844,000			279,750,000
Interest Rate Derivative Instruments Not Designated as Heding Instruments, Liability at Fair Value	(1,562,000)		(1,562,000)			(376,000)
Not Designated as Hedging Instrument | Swap-cash flow, hedge type one
Interest Rate Derivatives
Notional value	$ 29,865,000		$ 29,865,000			30,195,000
Interest rate	1.80%		1.80%
Interest Rate Derivative Instruments Not Designated as Heding Instruments, Liability at Fair Value	$ (136,000)		$ (136,000)			(34,000)
Not Designated as Hedging Instrument | Swap-cash flow, hedge type two
Interest Rate Derivatives
Notional value	$ 74,210,000		$ 74,210,000			75,030,000
Interest rate	1.80%		1.80%
Interest Rate Derivative Instruments Not Designated as Heding Instruments, Liability at Fair Value	$ (339,000)		$ (339,000)			(86,000)
Not Designated as Hedging Instrument | Swap-cash flow, hedge type three
Interest Rate Derivatives
Notional value	$ 31,675,000		$ 31,675,000			32,025,000
Interest rate	1.80%		1.80%
Interest Rate Derivative Instruments Not Designated as Heding Instruments, Liability at Fair Value	$ (145,000)		$ (145,000)			(37,000)
Not Designated as Hedging Instrument | Swap-cash flow, hedge type four
Interest Rate Derivatives
Notional value	$ 141,094,000		$ 141,094,000			142,500,000
Interest rate	1.81%		1.81%
Interest Rate Derivative Instruments Not Designated as Heding Instruments, Liability at Fair Value	$ (942,000)		$ (942,000)			(219,000)
Interest Expense
Interest Rate Derivatives
Reclassification of unrealized gain on discontinued cash flow hedges to interest expense	5,500,000	$ 1,900,000	6,300,000	$ 4,400,000
Accounts payable and other liabilities | Interest rate swap
Interest Rate Derivatives
Interest rate swap liability	$ (84,100,000)		$ (84,100,000)			(24,200,000)
Prepaid expenses and other assets | Interest rate swap
Interest Rate Derivatives
Interest Rate Cash Flow Hedge Asset at Fair Value						$ 4,300,000