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Shareholders equity, comprehensive loss and noncontrolling interest (Details) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Jun. 26, 2012	Feb. 21, 2012
Statement of Stockholders' Equity [Abstract]
Issuance of shares to noncontrolling shareholder for future earn-in, Shares				25,000
Issuance of cash to noncontrolling shareholder for future earn-in				$ 150
Cumulative effect of change in accounting principle, net of deferred tax	$ 1,011	$ 529
Issuance of common stock for cash			225,000