Shareholders' Equity - Narratives (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Aug. 11, 2016	Apr. 25, 2016
Class of Stock [Line Items]
Net proceeds from issuance of common stock	$ 94,538	$ 0
April ATM Program [Member]
Class of Stock [Line Items]
Maximum value of common stock to be issued				$ 50,000
Value of common stock issued	50,000
Net proceeds from issuance of common stock	47,700
Payments for commissions	$ 1,300
April ATM Program [Member] | Common Stock [Member]
Class of Stock [Line Items]
Shares issued	6,309,355
Price per share issued	$ 7.92
August ATM Program [Member]
Class of Stock [Line Items]
Maximum value of common stock to be issued			$ 50,000
Value of common stock issued	$ 50,000
Net proceeds from issuance of common stock	48,800
Payments for commissions	$ 1,000
August ATM Program [Member] | Common Stock [Member]
Class of Stock [Line Items]
Shares issued	6,709,377
Price per share issued	$ 7.45