CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 36,868	$ 29,997	$ 61,076	$ 50,134
Accounts receivable, net of allowance for doubtful accounts of $16,194 in 2014 and $11,900 in 2013	251,191	241,873
Refundable income taxes	926
Deferred income taxes	26,820	19,811
Non-trade receivables	4,503	6,852
Prepaid expenses and other current assets	17,916	19,578
Total current assets	338,224	318,111
Property and equipment, net	101,621	101,021
Goodwill	308,927	308,350
Other intangible assets, net	329,680	333,613
Other assets	26,068	25,182
Total assets	1,104,520	1,086,277	1,067,129
Current liabilities:
Trade accounts payable	37,503	34,089
Accrued expenses	133,168	120,803
Current portion of long-term debt	11,185	14,291
Obligations under capital leases	6,515	6,516
Deferred income taxes	3,218
Total current liabilities	191,589	175,699
Long-term liabilities	43,631	39,143
Long-term debt	450,036	345,506
Obligations under capital leases	14,485	13,724
Deferred income taxes	119,189	116,084
Total liabilities	818,930	690,156
Shareholder's equity:
Common stock, no par value, authorized 40,000,000 shares, issued and outstanding 21,344,741 in 2014 and 2013
Additional paid-in capital	248,036	247,053
Retained earnings	38,132	149,617
Accumulated other comprehensive (loss) income	(578)	(549)
Total shareholder's equity	285,590	396,121
Total liabilities and shareholder's equity	$ 1,104,520	$ 1,086,277