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Stock-based compensation (Tables)
9 Months Ended
Sep. 30, 2014
Schedule Of Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range Text Block
 (Not in thousands)
Exercise price per shareOptions outstandingWeighted-average exercise price of options outstandingWeighted-average remaining life of options outstanding in yearsOptions exercisable (fully vested)Weighted-average exercise price of options exercisable
   $ 272.00 44,797$ 272.00 0.38 44,797$ 272.00
Schedule Of Share Based Compensation Stock Options Activity Table Text Block
 (Not in thousands)Options Outstanding  Weighted-Average Exercise Price
Outstanding at December 31, 2012 160,986$ 222.71
Granted -  -
Exercised -  -
Forfeited -  -
Expired (60,549)  171.42
Outstanding at December 31, 2013 100,437$ 253.64
Granted -  -
Exercised -  -
Forfeited -  -
Expired (55,640)  238.85
Outstanding at September 30, 2014 44,797$ 272.00
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 December 31, 2012 491,223$ 20.59
Granted 229,131  28.20
Vested (131,324)  31.23
Forfeited (3,783)  24.63
Non-vested at December 31, 2013 585,247$ 21.16
Granted 235,112  29.56
Vested (302,517)  18.78
Forfeited (7,393)  29.49
Non-vested at September 30, 2014 510,449$ 26.32
Director 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 December 31, 2012 -$ -
Granted 20,930  29.43
Vested (20,930)  29.43
Forfeited -  -
Non-vested at December 31, 2013 -$ -
Granted 21,051  30.26
Vested (21,051)  30.26
Forfeited -  -
Non-vested at September 30, 2014 -$ -