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Financial Instruments and Fair Value Measurements (Details Textual) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended |  | 6 Months Ended | 12 Months Ended |
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Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011 | Jun. 30, 2012 Interest Rate Swap [Member] | Jun. 30, 2011 Interest Rate Swap [Member] | Jun. 30, 2012 Interest Rate Swap [Member] | Jun. 30, 2011 Interest Rate Swap [Member] | Jun. 30, 2012 Period From June 2012 Through December 2012 [Member] | Jun. 30, 2012 Period From January 2013 Through December 2013 [Member] | Jun. 30, 2012 Senior Notes [Member] | Dec. 31, 2011 Senior Notes [Member] | Oct. 04, 2010 Senior Notes [Member]
Secured Long-term Debt, Noncurrent |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 175,000
Long-term Debt, Fair Value |  |  |  |  |  |  |  |  |  |  |  | 186,048 | 179,156 |
Notional Amount of Foreign Currency Derivatives | 25,244 |  | 25,244 |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Derivative Instruments Held for Trading Purposes, Net | 1,435 | 746 | 558 | 2,654 |  |  |  |  |  |  |  |  |  |
Notional Amount of Cash Flow Hedge Instruments | 0 |  | 0 |  |  |  |  |  |  | 27,500 | 36,500 |  |  |
Notional Amount of Price Risk Cash Flow Hedge Derivatives | 3,250 |  | 3,250 |  | 6,500 |  |  |  |  |  |  |  |  |
Notional Amount of Interest Rate Fair Value Hedge Derivatives | 45,000 |  | 45,000 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  | 9.50% |  | 9.50%
Derivative, Variable Interest Rate | 7.20% |  | 7.20% |  |  |  |  |  |  |  |  |  |  |
Derivative, Fixed Interest Rate | 9.50% |  | 9.50% |  |  |  |  |  |  |  |  |  |  |
Increase Decrease In Derivative Interest Expenses |  |  |  |  |  | 168 | 175 | 393 | 380 |  |  |  |  |
Amortization of Debt Discount (Premium) |  |  |  |  |  |  |  |  |  |  |  | $ 3,558 | $ 3,807 |

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition Aggregate net gain and losses (whether realized or unrealized) on all derivative instruments held for trading purposes whether or not settled physically. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41322-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4F -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624186-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 02-3 -Paragraph 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Aggregate notional amount of all derivatives designated as cash flow hedging instruments. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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- Definition Aggregate notional amount of foreign currency exchange rate derivatives. Notional amount refers to the number of currency units specified in the foreign currency derivative contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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