Debt - Narrative (Details) (USD $) In Thousands, unless otherwise specified			12 Months Ended			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Line of Credit, Current Facility [Member]	Dec. 31, 2013 Line Of Credit, Previous Facility [Member]	Dec. 31, 2012 Line Of Credit, Previous Facility [Member]	Dec. 31, 2013 Ohio Department Of Development [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity			$ 300,000	$ 175,000
Line Of Credit Facility Maximum Borrowing Capacity			400,000
Line Of Credit Maturity Date			2018-06
Line of Credit Facility, Covenant Compliance			As of December 31, 2013 and December 31, 2012, the Company’s consolidated leverage ratio was below 1.0 to 1 and the Company was also in compliance with all of the current and former facilities’ other covenants, respectively.
Line of Credit Facility, Covenant Terms			In addition, the revised facility amended certain financial, acquisition and other covenants, but the consolidated leverage ratio calculation, for which access to credit under the former facility largely depended upon, remains relatively consistent and cannot exceed 3.50 to 1.
Long-term Debt, Weighted Average Interest Rate			1.66%		2.03%
Line Of Credit Facility Amount Outstanding			0		12,200
Debt Instrument Maturity Year						2021
Ohio Department of Development Term Loan	$ 2,428	$ 2,754				$ 3,500
Principal Repayment Commencement Date						2010-09
Debt Instrument Interest Rate Stated Percentage						1.00%
Debt Instrument Interest Rate Stated Percentage In Year Two						2.00%
Debt Instrument Interest Rate Stated Percentage In Year Seven						3.00%