Shareholders' Equity (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stockholders' Equity Note [Abstract]
Maximum offering price under ATM program	$ 100,000,000
Aggregate Number of Shares Sold	2,275
Aggregate Gross Proceeds	49,575,000
Aggregate Net Proceeds	$ 48,400,000	$ 0	$ 0	$ 48,400,000
Average Sales Price Per Share	$ 21.79
Stock issuance program, expiry date			February 2, 2012