Acquisition of LCA-Vision Inc (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 LCA Vision Inc [Member]		Jun. 30, 2014 LCA Vision Inc [Member]	May 12, 2014 LCA Vision Inc [Member]
Business Acquisition [Line Items]
Effective date of merger								May 12, 2014
Percentage of shares acquired by wholly-owned subsidiary (in hundredths)									100.00%
Fair value LCA-Vision stock						$ 103,896	[1]
Fair value of LCA-Vision restricted stock units, including payroll taxes						2,656	[2]
Total purchase price						106,552
Common Stock, outstanding (in shares)	19,049,582		19,049,582		18,903,245				19,347,554
Restricted stock, outstanding or deemed to be outstanding (in shares)									476,436
Goodwill	75,010		75,010		24,930				49,582
Fair value of the assets acquired and liabilities assumed [Abstract]
Cash and cash equivalents									29,042
Current assets, excluding cash and cash equivalents									6,114
Deferred tax asset, current									1,124
Property, plant and equipment									17,269
Identifiable intangible assets									39,050
Other assets									1,518
Total assets acquired at fair value									94,117
Current liabilities									(19,009)
Long-term debt									(1,603)
Deferred tax liability, long-term									(9,138)
Other long-term liabilities									(7,397)
Total liabilities assumed									(37,147)
Net assets acquired									56,970
Summarized combined result after giving effect acquisition adjustments [Abstract]
Net revenues	61,170	80,674	136,776	166,194
Net income (loss)	$ (14,734)	$ 5,762	$ (16,747)	$ 12,579
Net income (loss) per share: [Abstract]
Basic (in dollars per share)	$ (0.79)	$ 0.28	$ (0.89)	$ 0.61
Diluted (in dollars per share)	$ (0.79)	$ 0.27	$ (0.89)	$ 0.60
Shares used in calculating net income (loss) per share [Abstract]
Basic (in shares)	18,723,484	20,573,048	18,721,463	20,624,588
Diluted (in shares)	18,723,484	21,033,349	18,721,463	21,084,889

[1] Based on 19,347,554 outstanding shares of LCA-Vision common stock at May 12, 2014.

[2] Based on 476,436 outstanding or deemed to be outstanding restricted stock units of LCA-Vision common stock at May 12, 2014.