Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Trade accounts receivable, allowances (in dollars)	$ 15,569	$ 25,068
Property and equipment, accumulated depreciation	103,090	99,473
Other intangible assets, accumulated amortization	$ 26,026	$ 24,140
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares	125,000	125,000
Common stock, issued shares	34,624	34,618
Common stock, outstanding shares	34,624	34,618