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Income Taxes	3 Months Ended
	Mar. 31, 2017
Income Taxes [Abstract]
Income Taxes	8.    Income Taxes The Company had $0.3 million of unrecognized tax benefits at March 31, 2017, resulting from tax positions taken during the three months ended March 31, 2017.  In addition, the Company recognized approximately $0.3 million of benefits in each of the three months ended March 31, 2016 and 2017 related to tax positions taken during the year ended December 31, 2013. The Company did not incur expense for interest and penalties in the three months ended March 31, 2017, and recorded approximately $0.1 million of expense in the three months ended March 31, 2016. The Company does not expect its unrecognized tax benefits will be realized. If amounts accrued are less than amounts ultimately assessed by taxing authorities, the Company would record additional income tax expense. The Company does not anticipate significant changes to other unrecognized tax benefits. The Company paid $3.7 million and $0.2 million in income taxes during the three months ended March 31, 2016 and 2017, respectively.

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- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319

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