Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Revenues	$ 1,036,273	$ 1,090,630	$ 1,198,223
Cost of sales	536,109	579,825	603,893
Restructuring charges	0	0	3,985
Gross profit	500,164	510,805	590,345
Selling, general and administrative expenses	503,174	559,095	565,712
Restructuring charges	0	8,728	20,532
Asset impairments	3,144	15,306	8,827
Loss from operations	(6,154)	(72,324)	(4,726)
Foreign currency loss, net	(2,454)	(3,332)	(4,885)
Interest income	692	967	1,664
Interest expense	(836)	(969)	(806)
Other income, net	1,539	914	204
Loss before income taxes	(7,213)	(74,744)	(8,549)
Income tax (expense) benefit	(9,281)	(8,452)	3,623
Net loss	(16,494)	(83,196)	(4,926)
Dividends on Series A convertible preferred stock	(12,000)	(11,833)	(11,301)
Dividend equivalents on Series A convertible preferred shares related to redemption value accretion and beneficial conversion feature	(3,244)	(2,978)	(2,735)
Net loss attributable to common stockholders	$ (31,738)	$ (98,007)	$ (18,962)
Net loss per common share
Basic (in dollars per share)	$ (0.43)	$ (1.30)	$ (0.22)
Diluted (in dollars per share)	$ (0.43)	$ (1.30)	$ (0.22)