Debt (Additional Information) (Details) (USD $)	1 Months Ended	3 Months Ended			9 Months Ended										1 Months Ended					0 Months Ended	1 Months Ended	3 Months Ended	9 Months Ended	1 Months Ended
	Nov. 30, 2010	Sep. 30, 2013	Sep. 30, 2012	Mar. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jul. 13, 2011	Dec. 31, 2010	Nov. 23, 2010	Dec. 31, 2012 Minimum [Member]	Jul. 31, 2011 Credit Agreement [Member]	Sep. 30, 2013 Credit Agreement [Member]	Jul. 13, 2011 Credit Agreement [Member]	Sep. 30, 2013 Bank Term Loan [Member]	Jul. 31, 2012 Bank Term Loan [Member] Cash Flow Hedging [Member]	Jul. 13, 2011 Amended Credit Facility [Member]	Jul. 31, 2011 Amended Credit Facility [Member]	Dec. 31, 2012 Amended Credit Facility [Member]	Sep. 30, 2013 Amended Credit Facility [Member]	Jul. 31, 2011 Amended Credit Facility [Member] Minimum [Member]	Jul. 31, 2011 Amended Credit Facility [Member] Maximum [Member]	Jul. 13, 2011 Amended Credit Facility [Member] Federal Funds Rate [Member]	Jul. 13, 2011 Amended Credit Facility [Member] One Month LIBOR [Member]	Jul. 13, 2011 Amended Credit Facility [Member] Bank Term Loan [Member]	Jul. 13, 2011 Eurocurrency loans [Member] Credit Agreement [Member]	Sep. 30, 2013 Interest Rate Swap [Member]
Debt Instrument [Line Items]
Credit agreement, maximum borrowing capacity													$ 165,000,000							$ 265,000,000								$ 100,000,000
Credit agreement, agreement period																				5 years
Credit agreement, maturity date	Nov. 23, 2014																				Jul. 13, 2016
Reduction in interest costs																				0.25%
Size of permitted acquisitions													25,000,000							100,000,000
Permitted additional indebtedness													20,000,000							120,000,000
Revolving credit outstanding borrowings											100,000,000
Debt Instrument Lower Range Basis Spread On Variable Rate																	0.75%									0.50%
Debt Instrument Higher Range Basis Spread On Variable Rate																	1.50%										1.00%
Line of credit, interest rate description															The base reference rate is the greater of the prime rate; federal funds effective rate plus 50 basis points; and adjusted London interbank offered (“LIBO”) rate plus 100 basis points.
Line of credit, LIBOR rate, minimum spread																													1.75%
Line of credit, LIBOR rate, maximum spread																													2.50%
Unused commitment fee percentage																								0.20%	0.35%
Payments commencement date																					Sep. 30, 2011
Covenants, leverage ratio																3.0
Leverage ratio		1.03			1.03
Fixed Charge Coverage Ratio Minimum		2.23	1.93		2.23	1.93	2.06	2.27	2.18					1.0
Capitalized debt issuance costs									100,000	700,000		1,600,000
Amortization expense, debt issue costs		100,000	100,000		400,000	400,000
Capitalized debt issuance costs, net		1,400,000			1,400,000
Amount drawn on the line of credit to fund the acquisition of Curamik				145,000,000
Repayment of debt principal					17,371,000	17,242,000																24,500,000	16,800,000
Required payment on debt obligation within the next 12 months																							16,300,000
Repayments of Lines of Credit					8,000,000
Term loan debt																		81,300,000					81,300,000
LIBOR in Effect at Period End		0.1875%			0.1875%
Interest rate spread over variable rate (percent)		2.00%			2.00%													2.00%
Irrevocable standby letters of credit		1,400,000			1,400,000
Letter guarantee		100,000			100,000
Fair value of interest rate swap liability																														800,000
Option to buy out capital lease, year					2013
Capital lease, expiration date					2021
Capital lease obligation		8,000,000			8,000,000
Amortization expense related to the capital lease		100,000	100,000		300,000	300,000
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation		1,000,000			1,000,000				800,000
Interest expense on outstanding debt		500,000	800,000		1,700,000	2,300,000
Unused commitment fee		100,000	100,000		300,000	300,000
Interest rate swap derivative, percentage of debt hedged (percent)																			65.00%
Interest expense on capital lease		$ 100,000	$ 300,000		$ 400,000	$ 1,100,000