Equity Transactions and Stock-Based Compensation Plans (Tables)

9 Months Ended

Sep. 30, 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 nine months ended September 30, 2012 and 2011:

	Nine months ended September 30,
	2012		2011
Expected volatility	70	%	65	%
Risk-free interest rates	0.8	%	1.5	%
Expected life in years	5.12		4.33
Options granted	530,156		602,298
Grant-date fair value	$5.02		$4.69

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 and nine months ended September 30, 2012 and 2011 (amounts in thousands):

	Three months ended September 30,				Nine months ended September 30,
	2012		2011		2012		2011
General and administrative expense	$	665	$	919	$	2,221	$	2,812
Operating costs	4		79		56		216
	$	669	$	998	$	2,277	$	3,028

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 and nine months ended September 30, 2012 and 2011 (amounts in thousands):

	Three months ended September 30,				Nine months ended September 30,
	2012		2011		2012		2011
General and administrative expense	$	131	$	296	$	526	$	747
Operating costs	2		38		30		79
	$	133	$	334	$	556	$	826

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 and nine months ended September 30, 2012 and 2011 (amounts in thousands):

	Three months ended September 30,				Nine months ended September 30,
	2012		2011		2012		2011
General and administrative expense	$	979	$	409	$	2,381	$	1,231
Operating costs	90		93		327		229
	$	1,069	$	502	$	2,708	$	1,460

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. There were no time-based RSUs granted during the three months ended September 30, 2012. The following table summarizes the number and weighted-average grant-date fair value of the time-based RSUs granted during the nine months ended September 30, 2012 and the three and nine months ended September 30, 2011:

	Three months ended September 30,		Nine months ended September 30,
	2011		2012		2011
Time-based RSUs granted	12,750		356,813		246,223
Weighted-average grant-date fair value	$	15.50	$	8.21	$	11.20

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. There were no grants of performance-based RSUs during the three months ended September 30, 2012 or 2011. The following table summarizes the number and weighted-average grant-date fair value of performance-based RSUs granted during the nine months ended September 30, 2012 and 2011:

	Nine months ended September 30,
	2012		2011
Performance-based RSUs granted	221,495		146,479
Weighted-average grant-date fair value	$	9.85	$	10.23