Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Revenues		$ 1,088,205	$ 1,023,513	$ 1,036,273
Cost of sales		528,051	506,292	536,109
Gross profit		560,154	517,221	500,164
Selling, general and administrative expenses		495,028	494,601	503,174
Asset impairments		2,182	5,284	3,144
Income (loss) from operations		62,944	17,336	(6,154)
Foreign currency gains (losses), net		1,318	563	(2,454)
Interest income		1,281	870	692
Interest expense		(955)	(869)	(836)
Other income, net		569	280	1,539
Income (loss) before income taxes		65,157	18,180	(7,213)
Income tax expense		14,720	7,942	9,281
Net income (loss)		50,437	10,238	(16,494)
Dividends on Series A convertible preferred stock	[1]	(108,224)	(12,000)	(12,000)
Dividend equivalents on Series A convertible preferred shares related to redemption value accretion and beneficial conversion feature	[1]	(11,429)	(3,532)	(3,244)
Net loss attributable to common stockholders		$ (69,216)	$ (5,294)	$ (31,738)
Net loss per common share:
Basic (in dollars per share)		$ (1.01)	$ (0.07)	$ (0.43)
Diluted (in dollars per share)		$ (1.01)	$ (0.07)	$ (0.43)
Weighted average common shares outstanding:
Weighted average common shares outstanding - basic (shares)		68,421	72,255	73,371
Weighted average common shares outstanding - diluted (shares)		68,421	72,255	73,371

[1] On December 5, 2018, all issued and outstanding shares of Series A Convertible Preferred Stock were repurchased in exchange for cash or converted to common stock. As a result, amounts reported for the year ended December 31, 2018, include amounts resulting from the repurchase and conversion, in addition to dividends, payments to induce conversion, and accretion of dividend equivalents prior to December 5, 2018. See Note 1 — Basis of Presentation and Summary of Significant Accounting Policies, for additional information.