Restricted Stock Units and Long Term Incentive Plan (Details 2) (LTI Agreements, USD $)	3 Months Ended			3 Months Ended													3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Mar. 31, 2013 Low end of range	Mar. 31, 2012 Low end of range	Jun. 30, 2011 Low end of range	Mar. 31, 2010 Low end of range	Mar. 31, 2013 High end of range	Mar. 31, 2012 High end of range	Jun. 30, 2011 High end of range	Mar. 31, 2010 High end of range	Mar. 31, 2013 Employment Award	Mar. 31, 2012 Employment Award	Jun. 30, 2011 Employment Award	Mar. 31, 2010 Employment Award	Aug. 31, 2012 Employment Award	Mar. 31, 2013 Performance Award	Sep. 30, 2012 Performance Award	Mar. 31, 2012 Performance Award	Jun. 30, 2011 Performance Award
Long Term Incentive Plan
Target award				$ 20,000	$ 22,000	$ 23,000	$ 25,000	$ 680,000	$ 652,000	$ 550,000	$ 536,000							$ 20,000
Additional target award																		50,000
Portion of award in each grant (as a percent)												40.00%	50.00%	50.00%	50.00%		60.00%		50.00%	50.00%
Amount settled in cash																1,200,000	640,000
Period after vesting date within which award will be settled in cash													30 days	30 days			30 days	30 days	30 days	30 days
Period after issuance date of audited financials within which award will be settled in cash																	15 days	15 days	15 days	15 days
Compensation expense included in selling, general and administrative expense	737,000	561,000
Liability related to agreement included in accounts payable and accrued liabilities	$ 3,700,000		$ 3,600,000