Segment and Geographic Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended									12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013 segment	Dec. 31, 2012	Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of operating segment										1
Net revenue	$ 185,003	[1]	$ 174,282	$ 172,826	$ 155,753	$ 159,490	$ 136,786	$ 135,702	$ 126,610	$ 687,864	$ 558,588	$ 484,732
Long-lived assets	1,148,267					167,611				1,148,267	167,611
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue										629,459	512,044	453,163
Percentage of revenue by geographic segments										91.50%	91.70%	93.50%
Long-lived assets	1,139,210					166,129				1,139,210	166,129
Percentage of long-lived assets by geographic segments	99.20%					99.10%				99.20%	99.10%
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue										50,419	38,517	25,532
Percentage of revenue by geographic segments										7.30%	6.90%	5.30%
Long-lived assets	1,989					1,243				1,989	1,243
Percentage of long-lived assets by geographic segments	0.20%					0.70%				0.20%	0.70%
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue										7,986	8,027	6,037
Percentage of revenue by geographic segments										1.20%	1.40%	1.20%
Long-lived assets	$ 7,068					$ 239				$ 7,068	$ 239
Percentage of long-lived assets by geographic segments	0.60%					0.10%				0.60%	0.10%

[1] (2)Net income for the fourth quarter of 2013 includes a $10.9 million increase related to the progression in development work for IONSYS related to the Company’s Incline acquisition and a tax benefit of $13.6 million from reducing the Company’s deferred tax liabilities associated with the Incline acquisition.