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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Statement Of Cash Flows [Abstract]      
Senior notes, issuance costs $ 1,341 $ 1,345 $ 350
Common shares, issuance costs 721 1,055 835
Preferred shares, issuance costs $ 412 $ 845 $ 0