Supplemental Guarantor Information (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operations
Net cash provided by operations	$ 189,557,000	$ 81,450	$ 143,465,000
Investments
Capital expenditures	(21,289,000)	(15,758)	(14,968)
Proceeds from disposition of real estate		5,919
Other investments, net	1,920	2,101,000	6,820,000
Net cash used for investments	(19,369)	(7,738)	(8,148)
Financing
Net proceeds from revolving debt	23,000,000	32,000	49,700,000
Payments on revolving debt	(2,000)	(43,000,000)	(181,700,000)
Extinguishment of debt	(181,454,000)
Dividends on common stock	(56,290,000)	(10,369,000)
Purchases of treasury stock	(5,964,000)
Net proceeds from exercise of stock options	421,000	300,000	99,000
Excess tax benefit from option exercises	418	166,000	93,000
Intercompany activity
Net cash provided by (used for) financing	(221,869,000)	(20,903,000)	(131,808,000)
Net increase (decrease) in cash and temporary cash investments	(51,681,000)	52,809,000	3,509,000
Cash and temporary cash investments at beginning of year	61,118	8,309	4,800,000
Cash and temporary cash investments at end of year	9,437	61,118	8,309
Parent [Member]
Operations
Net cash provided by operations	13,334	8,607	(12,561)
Investments
Capital expenditures	(6,223)	(4,822)	(1,686)
Proceeds from disposition of real estate
Other investments, net	(857)	(797)	3,524
Net cash used for investments	(7,080)	(5,619)	1,838
Financing
Net proceeds from revolving debt	23,000	32,000	49,700
Payments on revolving debt	(2,000)	(43,000)	(181,700)
Extinguishment of debt	(181,454)
Dividends on common stock	(56,290)	(10,369)
Purchases of treasury stock	(5,964)
Net proceeds from exercise of stock options	421	300	99
Excess tax benefit from option exercises	418	166	93
Intercompany activity	163,109	71,964	144,175
Net cash provided by (used for) financing	(58,760)	51,061	12,367
Net increase (decrease) in cash and temporary cash investments	(52,506)	54,049	1,644
Cash and temporary cash investments at beginning of year	59,339	5,290	3,646
Cash and temporary cash investments at end of year	6,833	59,339	5,290
Guarantor Subsidiaries [Member]
Operations
Net cash provided by operations	178,367	72,843	156,026
Investments
Capital expenditures	(14,736)	(10,936)	(13,282)
Proceeds from disposition of real estate		5,919
Other investments, net	2,777	2,898	3,296
Net cash used for investments	(11,959)	(2,119)	(9,986)
Financing
Net proceeds from revolving debt
Payments on revolving debt
Extinguishment of debt
Dividends on common stock
Purchases of treasury stock
Net proceeds from exercise of stock options
Excess tax benefit from option exercises
Intercompany activity	(165,663)	(71,988)	(144,175)
Net cash provided by (used for) financing	(165,663)	(71,988)	(144,175)
Net increase (decrease) in cash and temporary cash investments	745	(1,264)	1,865
Cash and temporary cash investments at beginning of year	1,755	3,019	1,154
Cash and temporary cash investments at end of year	2,500	1,755	3,019
Non-Guarantors [Member]
Operations
Net cash provided by operations	(2,144)
Investments
Capital expenditures	(330)
Proceeds from disposition of real estate
Other investments, net
Net cash used for investments	(330)
Financing
Net proceeds from revolving debt
Payments on revolving debt
Dividends on common stock
Net proceeds from exercise of stock options
Excess tax benefit from option exercises
Intercompany activity	2,554	24
Net cash provided by (used for) financing	2,554	24
Net increase (decrease) in cash and temporary cash investments	80	24
Cash and temporary cash investments at beginning of year	24
Cash and temporary cash investments at end of year	$ 104	$ 24