Supplemental Guarantor Infromation Supplemental Guarantor Information (Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	$ 55,900	$ 11,646
Cash flow from investing activities:
(Loans to) repayments from affiliates	0	0
Capital expenditures	(46,464)	(38,518)
Proceeds from derivative instruments	(194)	1,472
Proceeds from sale of assets	2,523	0
Other	2,834	284
Net cash used in investing activities	(41,301)	(36,762)
Cash flow from financing activities:
Loans from (repayments to) affiliates		0
Short-term debt borrowings	(1,019)	(5,649)
Revolving Facility borrowings	209,000	111,000
Revolving Facility reductions	(205,000)	(70,500)
Principal payments on long term debt	(126)	(140)
Supply chain financing	(9,455)	(8,369)
Proceeds from exercise of stock options	2,813	175
Purchase of treasury shares	(435)	(709)
Revolver Refinancing Costs	(2,636)	0
Proceeds from (Payments for) Other Financing Activities	918	(6,440)
Net cash provided by financing activities	(5,940)	19,368
Net (decrease) increase in cash and cash equivalents	8,659	(5,748)
Effect of exchange rate changes on cash and cash equivalents	181	(583)
Cash and cash equivalents at beginning of period	11,888	17,317
Cash and cash equivalents at end of period	20,728	10,986
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	(11,480)	(6,611)
Cash flow from investing activities:
(Loans to) repayments from affiliates	8,184	7,566
Capital expenditures	0	0
Proceeds from derivative instruments	0	0
Proceeds from sale of assets	0
Other	0
Net cash used in investing activities	8,184	7,566
Cash flow from financing activities:
Loans from (repayments to) affiliates		0
Short-term debt borrowings	0	0
Revolving Facility borrowings	0	0
Revolving Facility reductions	0	0
Principal payments on long term debt	0	0
Supply chain financing	0	0
Proceeds from exercise of stock options	2,813	175
Purchase of treasury shares	(435)	(709)
Proceeds from (Payments for) Other Financing Activities	918	(421)
Net cash provided by financing activities	3,296	(955)
Net (decrease) increase in cash and cash equivalents	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0	0
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	33,155	13,289
Cash flow from investing activities:
(Loans to) repayments from affiliates	0	0
Capital expenditures	(31,882)	(24,633)
Proceeds from derivative instruments	74	(140)
Proceeds from sale of assets	0
Other	0
Net cash used in investing activities	(31,808)	(24,557)
Cash flow from financing activities:
Loans from (repayments to) affiliates		(7,566)
Short-term debt borrowings	(23)	0
Revolving Facility borrowings	131,000	61,000
Revolving Facility reductions	(124,000)	(42,500)
Principal payments on long term debt	(66)	(84)
Supply chain financing	0	0
Proceeds from exercise of stock options	0	0
Purchase of treasury shares	0	0
Proceeds from (Payments for) Other Financing Activities	0	(15)
Net cash provided by financing activities	(3,593)	10,835
Net (decrease) increase in cash and cash equivalents	(2,246)	(433)
Effect of exchange rate changes on cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	4,752	4,425
Cash and cash equivalents at end of period	2,506	3,992
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	34,225	4,968
Cash flow from investing activities:
(Loans to) repayments from affiliates	0	0
Capital expenditures	(14,582)	(13,885)
Proceeds from derivative instruments	(268)	1,612
Proceeds from sale of assets	2,523
Other	2,834
Net cash used in investing activities	(9,493)	(12,205)
Cash flow from financing activities:
Loans from (repayments to) affiliates		0
Short-term debt borrowings	(996)	(5,649)
Revolving Facility borrowings	78,000	50,000
Revolving Facility reductions	(81,000)	(28,000)
Principal payments on long term debt	(60)	(56)
Supply chain financing	(9,455)	(8,369)
Proceeds from exercise of stock options	0	0
Purchase of treasury shares	0	0
Proceeds from (Payments for) Other Financing Activities	0	(6,004)
Net cash provided by financing activities	(13,827)	1,922
Net (decrease) increase in cash and cash equivalents	10,905	(5,315)
Effect of exchange rate changes on cash and cash equivalents	181	(583)
Cash and cash equivalents at beginning of period	7,136	12,892
Cash and cash equivalents at end of period	18,222	6,994
Consolidating Entries and Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	0	0
Cash flow from investing activities:
(Loans to) repayments from affiliates	(8,184)	(7,566)
Capital expenditures	0	0
Proceeds from derivative instruments	0	0
Proceeds from sale of assets	0
Other	0
Net cash used in investing activities	(8,184)	(7,566)
Cash flow from financing activities:
Loans from (repayments to) affiliates		7,566
Short-term debt borrowings	0	0
Revolving Facility borrowings	0	0
Revolving Facility reductions	0	0
Principal payments on long term debt	0	0
Supply chain financing	0	0
Proceeds from exercise of stock options	0	0
Purchase of treasury shares	0	0
Proceeds from (Payments for) Other Financing Activities	0	0
Net cash provided by financing activities	8,184	7,566
Net (decrease) increase in cash and cash equivalents	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	$ 0	$ 0