Public Offering (Detail Textuals) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	6 Months Ended
	Jun. 30, 2014	Jul. 31, 2014
Stockholders Equity Note [Line Items]
Common stock shares sold during the period	3,450,000
Net proceeds from the offering after payment of underwriting discounts and expenses of the offering		$ 128,686
Underwriters' option
Stockholders Equity Note [Line Items]
Common stock shares sold during the period	450,000
Public offering price per share (in dollars per share)	$ 38.82