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Condensed Consolidated Statements of Cash Flows (Parenthetical) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Statement Of Cash Flows [Abstract]    
Senior notes, issuance cost $ 650 $ 643
Preferred shares, issuance cost 546  
Common shares, issuance cost $ 410 $ 441