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Fair value measurements (Tables)

9 Months Ended

Sep. 30, 2015

Fair Value Disclosures [Abstract]

Schedule of valuation methodology for assets and liabilities at fair value

The following section describes the valuation methodology used to measure our financial assets and liabilities that were accounted for at fair value and are categorized based on the fair value hierarchy described in Accounting Standards Codification ("ASC") 820 "Fair Value Measurements and Disclosures."

Overview of Century’s valuation methodology
	Level	Significant inputs
Cash equivalents	1	Quoted market prices
Trust assets (1)	1	Quoted market prices
Surety bonds	1	Quoted market prices

(1) Trust assets are currently invested in money market funds. These trust assets are held to fund the non-qualified supplemental executive pension benefit obligations for certain of our officers. The trust has sole authority to invest the funds in secure interest producing investments consisting of short-term securities issued or guaranteed by the United States government or cash and cash equivalents.

Financial assets and liabilities at fair value on a recurring basis

The following table sets forth our financial assets and liabilities that were accounted for at fair value on a recurring basis by the level of input.  

Recurring Fair Value Measurements	As of September 30, 2015
	Level 1			Level 2			Level 3			Total
ASSETS:
Cash equivalents	$	119,194		$	—		$	—		$	119,194
Trust assets	5,998			—			—			5,998
Surety bonds	1,870			—			—			1,870
TOTAL	$	127,062		$	—		$	—		$	127,062

Recurring Fair Value Measurements	As of December 31, 2014
	Level 1			Level 2			Level 3			Total
ASSETS:
Cash equivalents	$	137,712		$	—		$	—		$	137,712
Trust assets	8,067			—			—			8,067
Surety bonds	1,987			—			—			1,987
TOTAL	$	147,766		$	—		$	—		$	147,766

X

- Definition

Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, applied during the period to each separate class of assets, liabilities, and financial instruments classified in shareholders' equity that are measured on a recurring and/or nonrecurring basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 820



-SubTopic 10



-Section 50



-Paragraph 2



-Subparagraph (bbb)



-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 820



-SubTopic 10



-Section 50



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258

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