Derivatives and Hedging Activities Effect of Derivative Instruments on Statement of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018		Jan. 01, 2017	[2]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI on Derivatives	$ 990
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)		$ 336
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income	(907)
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)		(1,168)
Gain (loss) on cash flow hedge ineffectiveness		(11)
Interest rate products
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI on Derivatives	990
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)		336
Interest rate products | Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income	$ (907)
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)		$ (1,168)
Retained Earnings
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification due to change in accounting principle			$ (334)	[1]	$ (1,535)
Accounting Standards Update 2017-12 | Retained Earnings
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification due to change in accounting principle			$ 5

[1] Reclassification due to the adoption of ASU 2016-01 and ASU 2017-12. See Part II. Item 8. “Financial Statements and Supplementary Data - Note 1: Basis of Presentation and Summary of Significant Accounting Policies.”

[2] Reclassification due to the adoption of ASU 2018-02. See Part II. Item 8. “Financial Statements and Supplementary Data - Note 1: Basis of Presentation and Summary of Significant Accounting Policies.”