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Transactions with Olympus Corporation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	0 Months Ended
	Mar. 31, 2015	Apr. 30, 2015	May 08, 2015
Acquisition of Olympus' Interest in the Joint Venture [Abstract]
Payment totalling	$ 2.8us-gaap_PaymentsForPreviousAcquisition
Remaining payment obligation	3.2
Purchase price payment agreement term	2 years
Subsequent Event [Member]
Acquisition of Olympus' Interest in the Joint Venture [Abstract]
Total purchase price		6
Amendment One to Joint Venture Termination Agreement [Member] \| Subsequent Event [Member]
Acquisition of Olympus' Interest in the Joint Venture [Abstract]
Purchase price remaining balance		3.2
Interest rate on the purchase price of remaining balance (in hundredths)		6.00%
Purchase price principal amount payable on May 8, 2015		1
Purchase price principal amount payable on September 30, 2015		0.5
Purchase price principal amount payable on December 31, 2015		0.5
Purchase price principal amount payable on March 31, 2016		0.5
Purchase price principal amount and accrued interest payable on May 8, 2016		0.7
Acquired Olympus Ownership [Member]
Acquisition of Olympus' Interest in the Joint Venture [Abstract]
Additional interest expense	0.2
Remaining Unrecognized Future Discount	0.1
Extended purchase price amount in default prior to March 1, 2020	16
Acquired Olympus Ownership [Member] \| Subsequent Event [Member]
Acquisition of Olympus' Interest in the Joint Venture [Abstract]
Total payments to be made			$ 6.0