Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Level 1 Assets: Quoted Prices In Active Markets
Assets:
Total Assets at Fair Value	$ 1,529
Level 1 Assets: Quoted Prices In Active Markets | Mexican Peso Option Contracts
Assets:
Total Assets at Fair Value
Liabilities:
Total Liabilities at Fair Value
Level 1 Assets: Quoted Prices In Active Markets | Stock Index Funds | Small Cap
Assets:
Total Assets at Fair Value	12
Level 1 Assets: Quoted Prices In Active Markets | Stock Index Funds | Mid Cap
Assets:
Total Assets at Fair Value	11
Level 1 Assets: Quoted Prices In Active Markets | Stock Index Funds | Large Cap
Assets:
Total Assets at Fair Value	12
Level 1 Assets: Quoted Prices In Active Markets | Cash and Cash Equivalents
Assets:
Total Assets at Fair Value	1,494
Level 2 Assets: Observable Inputs Other Than Market Prices
Assets:
Total Assets at Fair Value	29
Level 2 Assets: Observable Inputs Other Than Market Prices | Mexican Peso Option Contracts
Assets:
Total Assets at Fair Value	29
Level 2 Assets: Observable Inputs Other Than Market Prices | Stock Index Funds | Small Cap
Assets:
Total Assets at Fair Value
Level 2 Assets: Observable Inputs Other Than Market Prices | Stock Index Funds | Mid Cap
Assets:
Total Assets at Fair Value
Level 2 Assets: Observable Inputs Other Than Market Prices | Stock Index Funds | Large Cap
Assets:
Total Assets at Fair Value
Level 2 Assets: Observable Inputs Other Than Market Prices | Cash and Cash Equivalents
Assets:
Total Assets at Fair Value
Level 3 Assets: Unobservable Inputs
Assets:
Total Assets at Fair Value
Level 3 Assets: Unobservable Inputs | Mexican Peso Option Contracts
Assets:
Total Assets at Fair Value
Liabilities:
Total Liabilities at Fair Value
Level 3 Assets: Unobservable Inputs | Stock Index Funds | Small Cap
Assets:
Total Assets at Fair Value
Level 3 Assets: Unobservable Inputs | Stock Index Funds | Mid Cap
Assets:
Total Assets at Fair Value
Level 3 Assets: Unobservable Inputs | Stock Index Funds | Large Cap
Assets:
Total Assets at Fair Value
Level 3 Assets: Unobservable Inputs | Cash and Cash Equivalents
Assets:
Total Assets at Fair Value