Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Condensed Consolidated Balance Sheets [Abstract]
Allowances	$ 20,837	$ 10,513
Series A preferred shares, par value	$ 0.001	$ 0.001
Series A preferred shares, issued and outstanding	200,000	200,000
Series A preferred shares, redemption value and liquidation preference	$ 203,033	$ 0
Preferred shares, par value	$ 0.001	$ 0.001
Preferred shares, authorized	5,000,000	5,000,000
Preferred shares, outstanding	0	0
Common shares, par value	$ 0.001	$ 0.001
Common shares, authorized	250,000,000	250,000,000
Common shares, issued	92,213,732	91,662,656
Common shares, outstanding	85,804,571	88,450,203
Treasury stock, shares	6,409,161	3,212,453