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Debt (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Short-term debt:
Bank Credit Facility		$ 0	$ 38,000
Long-term debt, current and noncurrent:
Long-term debt		249,346	199,939
Total	[1]	$ 249,346	237,939
Final Maturity		2019
Senior Note 4.50 % [Member]
Long-term debt, current and noncurrent:
Long-term debt	[1]	$ 249,346	0
Debt Effective Interest Rates	[1]	4.50%
Final Maturity	[1]	2025
Senior Note 6.05 % [Member]
Long-term debt, current and noncurrent:
Long-term debt	[1]	$ 0	74,989
Debt Effective Interest Rates	[1]	6.10%
Final Maturity	[1]	2015
Senior Note 6.85 % [Member]
Long-term debt, current and noncurrent:
Long-term debt	[1]	$ 0	$ 124,950
Debt Effective Interest Rates	[1]	6.90%
Final Maturity	[1]	2016
[1] The Company designates debt obligations as “long-term” based on maturity date at issuance.

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13,16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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