CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME
Net sales	$ 1,046,438	$ 974,429	$ 907,794
Material costs	319,046	296,193	270,210
Personnel costs	369,738	335,328	321,529
Other operating expenses	186,304	178,918	169,131
Depreciation and amortization	37,486	34,652	30,969
Income from operations	133,864	129,338	115,955
Interest expense, net	26,475	31,169	31,821
Extinguishment of debt	6,645
Income before taxes	100,744	98,169	84,134
Provision for income taxes	37,160	34,477	29,657
Net income	63,584	63,692	54,477
Other comprehensive income (loss):
Unrealized gain/(loss) on SERP net of taxes of $531, $439, and $546 for 2013, 2012 and 2011, respectively	899	(734)	(906)
Total other comprehensive income (loss)	899	(734)	(906)
Comprehensive income	$ 64,483	$ 62,958	$ 53,571
Basic Per Common Share Data
Net income (in dollars per share)	$ 1.83	$ 1.86	$ 1.62
Shares used to compute basic per common share amounts (in shares)	34,818,214	34,282,591	33,544,813
Diluted Per Common Share Data
Net income (in dollars per share)	$ 1.80	$ 1.83	$ 1.59
Shares used to compute diluted per common share amounts (in shares)	35,394,721	34,832,830	34,220,256