Stock-based compensation (Tables)

12 Months Ended

Dec. 31, 2012

Schedule Of Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range Text Block

	(Not in thousands)
Exercise price range per share					Options outstanding	Weighted-average exercise price of options outstanding		Weighted-average remaining life of options outstanding in years	Options exercisable (fully vested)	Weighted-average exercise price of options exercisable
$	159.95	-	$	185.00	56,386	$	167.84	0.20	56,386	$	167.84
$	192.50	-	$	272.00	104,600	$	252.29	1.50	104,600	$	252.29
$	159.95	-	$	272.00	160,986	$	222.71	1.04	160,986	$	222.71

Schedule Of Share Based Compensation Stock Options Activity Table Text Block

(Not in thousands)	Options outstanding		Weighted-average exercise price
Outstanding at January 1, 2010	255,267	$	206.44
Granted	-		-
Exercised	-		-
Forfeited	-		-
Expired	(27,749)		204.27
Outstanding at December 31, 2010	227,518	$	206.71
Granted	-		-
Exercised	-		-
Forfeited	-		-
Expired	(20,572)		195.48
Outstanding at December 31, 2011	206,946	$	207.83
Granted	-		-
Exercised	-		-
Forfeited	-		-
Expired	(45,960)		155.68
Outstanding at December 31, 2012	160,986	$	222.71

Management Member

Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block]

(Not in thousands)	Restricted stock		Weighted-average grant date fair value
Non-vested at January 1, 2010	13,852	$	236.20
Granted	152,541		27.00
Vested	(34,088)		78.70
Forfeited	(19,131)		32.40
Non-vested at December 31, 2010	113,174	$	36.06
Granted	155,945		32.35
Vested	(5,156)		89.97
Forfeited	(22,029)		42.03
Non-vested at December 31, 2011	241,934	$	31.98
Granted	359,427		17.72
Vested	(96,353)		37.61
Forfeited	(13,785)		26.59
Non-vested at December 31, 2012	491,223	$	20.59

Director Member

Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block]

(Not in thousands)	Restricted stock		Weighted-average grant date fair value
Nonvested at January 1, 2010	-		-
Granted	30,590	$	29.50
Vested	(30,590)		29.50
Forfeited	-		-
Non-vested at December 31, 2010	-		-
Granted	30,163	$	26.72
Vested	(30,163)		26.72
Forfeited	-		-
Non-vested at December 31, 2011	-		-
Granted	41,174	$	16.37
Vested	(41,174)		16.37
Forfeited	-		-
Non-vested at December 31, 2012	-		-