Supplemental Cash Flow Information	12 Months Ended
Supplemental Cash Flow Information	Dec. 31, 2011
Supplemental Cash Flow Information [Abstract]
Supplemental Cash Flow Information	14. Supplemental Cash Flow Information Cash paid for interest for the years ended December 31, 2011, 2010, and 2009 was $0.8 million, $0.4 million, and $0.5 million, respectively. Income taxes paid, net of refunds, for the years ended December 31, 2011, 2010, and 2009 was $11.1 million, $16.0 million, and $3.8 million, respectively. During the year ended December 31, 2009, the Company exchanged shares of its common stock for approximately $6.0 million of its 5.00% Convertible Senior Notes. The Company has reflected $(0.5) million and $1.1 million of its capital expenditures as a non-cash decrease and increase in accounts payable and accrued liabilities for the years ended December 31, 2011 and 2010, respectively.

The entire disclosure for supplemental cash flow activities, including cash, noncash, and part noncash transactions, for the period. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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