Use of Derivative Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments [Table Text Block]

The following table details the Company’s outstanding interest rate swaps as of September 30, 2017. All of the Company's interest rate swaps are designated as qualifying cash flow hedges.

Interest Rate Derivative Counterparty	Trade Date	Effective Date	Notional Amount (in thousands)		Fair Value (in thousands)			Pay Fixed Interest Rate		Receive Variable Interest Rate	Maturity Date
Regions Bank	Mar-01-2013	Mar-01-2013	$	25,000	$	194		1.3300	%	One-month L	Feb-14-2020
Capital One, N.A.	Jun-13-2013	Jul-01-2013	$	50,000	$	(25	)	1.6810	%	One-month L	Feb-14-2020
Capital One, N.A.	Jun-13-2013	Aug-01-2013	$	25,000	$	(26	)	1.7030	%	One-month L	Feb-14-2020
Regions Bank	Sep-30-2013	Feb-03-2014	$	25,000	$	(196	)	1.9925	%	One-month L	Feb-14-2020
The Toronto-Dominion Bank	Oct-14-2015	Sep-29-2016	$	25,000	$	255		1.3830	%	One-month L	Sep-29-2020
PNC Bank, N.A.	Oct-14-2015	Sep-29-2016	$	50,000	$	497		1.3906	%	One-month L	Sep-29-2020
Regions Bank	Oct-14-2015	Sep-29-2016	$	35,000	$	354		1.3858	%	One-month L	Sep-29-2020
U.S. Bank, N.A.	Oct-14-2015	Sep-29-2016	$	25,000	$	247		1.3950	%	One-month L	Sep-29-2020
Capital One, N.A.	Oct-14-2015	Sep-29-2016	$	15,000	$	148		1.3950	%	One-month L	Sep-29-2020
Royal Bank of Canada	Jan-08-2015	Mar-20-2015	$	25,000	$	52		1.7090	%	One-month L	Mar-21-2021
The Toronto-Dominion Bank	Jan-08-2015	Mar-20-2015	$	25,000	$	50		1.7105	%	One-month L	Mar-21-2021
The Toronto-Dominion Bank	Jan-08-2015	Sep-10-2017	$	100,000	$	(1,550	)	2.2255	%	One-month L	Mar-21-2021
Wells Fargo, N.A.	Jan-08-2015	Mar-20-2015	$	25,000	$	19		1.8280	%	One-month L	Mar-31-2022
The Toronto-Dominion Bank	Jan-08-2015	Feb-14-2020	$	25,000	$	(196	)	2.4535	%	One-month L	Mar-31-2022
Regions Bank	Jan-08-2015	Feb-14-2020	$	50,000	$	(413	)	2.4750	%	One-month L	Mar-31-2022
Capital One, N.A.	Jan-08-2015	Feb-14-2020	$	50,000	$	(467	)	2.5300	%	One-month L	Mar-31-2022
The Toronto-Dominion Bank	Jul-20-2017	Oct-30-2017	$	25,000	$	75		1.8485	%	One-month L	Jan-04-2023
Royal Bank of Canada	Jul-20-2017	Oct-30-2017	$	25,000	$	76		1.8505	%	One-month L	Jan-04-2023
Wells Fargo, N.A.	Jul-20-2017	Oct-30-2017	$	25,000	$	76		1.8505	%	One-month L	Jan-04-2023
PNC Bank, N.A.	Jul-20-2017	Oct-30-2017	$	25,000	$	75		1.8485	%	One-month L	Jan-04-2023
PNC Bank, N.A.	Jul-20-2017	Oct-30-2017	$	50,000	$	152		1.8475	%	One-month L	Jan-04-2023

Schedule of interest rate swaps

The fair value of the interest rate swaps outstanding as of September 30, 2017 and December 31, 2016 was as follows.

Balance Sheet Line Item (in thousands)	Notional Amount September 30, 2017		Fair Value September 30, 2017			Notional Amount December 31, 2016		Fair Value December 31, 2016
Interest rate swaps-Asset	$	400,000	$	2,270		$	300,000	$	1,471
Interest rate swaps-Liability	$	325,000	$	(2,873	)	$	375,000	$	(2,438	)

Schedule of the location in the financial statements of the gain or loss recognized on interest rate swaps

The table below details the location in the financial statements of the gain or loss recognized on interest rate swaps designated as qualifying cash flow hedges for the three and nine months ended September 30, 2017 and September 30, 2016 (in thousands).

	Three months ended September 30,				Nine months ended September 30,
	2017		2016		2017			2016
Amount of income (loss) recognized in accumulated other comprehensive loss on interest rate swaps (effective portion)	$	316	$	2,159	$	(1,126	)	$	(16,206	)
Amount of loss reclassified from accumulated other comprehensive loss into income (loss) as interest expense (effective portion)	$	282	$	704	$	1,426		$	2,178
Amount of gain recognized in interest expense (ineffective portion)	$	61	$	—	$	88		$	—

Schedule of financial instruments accounted for at fair value on a recurring basis

The following sets forth the Company’s financial instruments that are accounted for at fair value on a recurring basis as of September 30, 2017 and December 31, 2016. 

				Fair Value Measurements as of September 30, 2017 Using
Balance Sheet Line Item (in thousands)	Fair Value September 30, 2017			Level 1		Level 2			Level 3
Interest rate swaps-Asset	$	2,270		$	—	$	2,270		$	—
Interest rate swaps-Liability	$	(2,873	)	$	—	$	(2,873	)	$	—

				Fair Value Measurements as of December 31, 2016 Using
Balance Sheet Line Item (in thousands)	Fair Value December 31, 2016			Level 1		Level 2			Level 3
Interest rate swaps-Asset	$	1,471		$	—	$	1,471		$	—
Interest rate swaps-Liability	$	(2,438	)	$	—	$	(2,438	)	$	—