Income Tax - Tax Carryforwards (Details) $ in Millions	3 Months Ended
Mar. 31, 2016 USD ($)
Alternative Minimum Tax [Member]
Tax Credit Carryforward [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ (4.4)

Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32123-109318

Name:	us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration