Subsequent events (Tables)

6 Months Ended

Jun. 30, 2016

Subsequent Events [Abstract]

Unsecured Senior Line of Credit Amendment [Table Text Block]

On July 29, 2016, we amended our unsecured senior line of credit and recognized a loss on early extinguishment of debt of approximately $2.4 million related to the write-off of unamortized loan fees. Key changes are summarized below:

	As of July 29, 2016	Prior Agreement
Commitments Available for Borrowing	$1.65 billion	$1.50 billion
Interest Rate	LIBOR+1.00%	LIBOR+1.10%
Maturity Date	October 29, 2021	January 3, 2019