Equity Transactions And Stock-Based Compensation Plans (Tables)

3 Months Ended

Mar. 31, 2012

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The following table summarizes the assumptions used in the Black-Scholes option-pricing model based on a weighted-average calculation for the three months ended March 31, 2012 and 2011:

	Three months ended March 31,
	2012		2011
Expected volatility	70	%	65	%
Risk-free interest rates	0.8	%	1.5	%
Expected life in years	5.31		4.33
Options granted	475,156		597,298
Grant-date fair value	$5.21		$4.67

Stock Options [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan

The following table summarizes the compensation expense recognized for stock option awards during the three months ended March 31, 2012 and 2011 (amounts in thousands):

	Three months ended March 31,
	2012		2011
General and administrative expense	$	919	$	997
Operating costs	44		81
	$	963	$	1,078

Restricted Stock [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan

The following table summarizes the compensation expense recognized for restricted stock awards during the three months ended March 31, 2012 and 2011 (amounts in thousands):

	Three months ended March 31,
	2012		2011
General and administrative expense	$	216	$	160
Operating costs	15		24
	$	231	$	184

Restricted Stock Units (RSUs) [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan

The following table summarizes the compensation expense recognized for restricted stock unit awards during the three months ended March 31, 2012 and 2011 (amounts in thousands):

	Three months ended March 31,
	2012		2011
General and administrative expense	$	658	$	389
Operating costs	148		61
	$	806	$	450

Schedule of Share-based Compensation, Activity

Our time-based RSUs generally vest over a three-year period, with fair values based on the closing price of our common stock on the date of grant.

	Three months ended March 31,
	2012		2011
Time-based RSUs granted	205,313		102,903
Weighted-average grant-date fair value	$	9.07	$	9.01

Our performance-based RSUs are granted at a target number of issuable shares, for which the final number of shares of common stock is adjusted based on our actual achievement levels that are measured against predetermined performance conditions.

	Three months ended March 31,
	2012		2011
Performance-based RSUs granted	221,495		146,479
Weighted-average grant-date fair value	$	9.85	$	10.23