Earnings Per Share (Details 1) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Antidilutive common stock equivalents excluded from the calculation of diluted earnings (loss) per share
Antidilutive shares excluded from calculation of diluted earnings (loss) per share	592	1,124	685	451
Stock options [Member]
Antidilutive common stock equivalents excluded from the calculation of diluted earnings (loss) per share
Antidilutive shares excluded from calculation of diluted earnings (loss) per share	362	417	440	289
Restricted stock awards [Member]
Antidilutive common stock equivalents excluded from the calculation of diluted earnings (loss) per share
Antidilutive shares excluded from calculation of diluted earnings (loss) per share	9	285	24	46
Performance-based restricted stock units [Member]
Antidilutive common stock equivalents excluded from the calculation of diluted earnings (loss) per share
Antidilutive shares excluded from calculation of diluted earnings (loss) per share	1	156	1	116
Employee stock purchase plan [Member]
Antidilutive common stock equivalents excluded from the calculation of diluted earnings (loss) per share
Antidilutive shares excluded from calculation of diluted earnings (loss) per share	220	266	220	0