Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Line Items]
Provision for income tax		$ 807	$ 1,169	$ 2,242
Special dividend distribution repatriated from foreign subsidiary	$ 12,800
Undistributed earnings of foreign subsidiaries	176,200	176,200
Deferred tax assets, change in valuation allowance		1,400	3,400	4,400
US federal net operating loss carryforwards	114,200	114,200
Research and development, orphan drug and investment tax credit carryforwards gross amount	12,200	12,200
State net operating loss carryforwards	25,900	25,900
State research and development tax credit carryforwards	2,200	2,200
Unrecognized tax benefits	5,470	5,470	5,876	$ 6,138	$ 6,053
Unrecognized tax benefits that would impact effective tax rate	1,800	1,800
Unrecognized tax benefits, amount offset by valuation allowance	3,700	3,700
Accrued interest related to tax positions	1,700	1,700	$ 1,500
Relates to Stock Option Deductions When Recognized [Member]
Income Tax Disclosure [Line Items]
Deferred tax assets, change in valuation allowance		3,800
NovaMed [Member]
Income Tax Disclosure [Line Items]
Foreign net operating loss carryforwards	$ 52,000	$ 52,000
China [Member]
Income Tax Disclosure [Line Items]
Statutory income tax rate		25.00%	25.00%	25.00%
Income tax examination, period		5 years
Minimum [Member] | Domestic Tax Authority [Member]
Income Tax Disclosure [Line Items]
Operating loss carryforward, expiration		Dec. 31, 2020
Minimum [Member] | U S Federal Reaserch [Member]
Income Tax Disclosure [Line Items]
Operating loss carryforward, expiration		Dec. 31, 2018
Minimum [Member] | Foreign Tax Authority [Member] | NovaMed [Member]
Income Tax Disclosure [Line Items]
Operating loss carryforward, expiration		Dec. 31, 2016
Minimum [Member] | State and Local Jurisdiction [Member]
Income Tax Disclosure [Line Items]
Operating loss carryforward, expiration		Dec. 31, 2016
Maximum [Member] | Domestic Tax Authority [Member]
Income Tax Disclosure [Line Items]
Operating loss carryforward, expiration		Dec. 31, 2035
Maximum [Member] | U S Federal Reaserch [Member]
Income Tax Disclosure [Line Items]
Operating loss carryforward, expiration		Dec. 31, 2035
Maximum [Member] | Foreign Tax Authority [Member] | NovaMed [Member]
Income Tax Disclosure [Line Items]
Operating loss carryforward, expiration		Dec. 31, 2020
Maximum [Member] | State and Local Jurisdiction [Member]
Income Tax Disclosure [Line Items]
Operating loss carryforward, expiration		Dec. 31, 2030