Fair Value Measurements (Level 3 Contingent Purchase Price) (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Mar. 31, 2014 Incline Therapeutics, Inc. [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Mar. 31, 2013 Incline Therapeutics, Inc. [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]
Fair Value Measurment, Contingent Purchase Price [Roll Forward]
Balance at beginning of period	$ 304,627	$ 302,363	$ 302,363	$ 18,971
Fair value of contingent purchase price with respect to Incline as of January 4, 2013					0	87,200
Fair value adjustment to contingent purchase price included in net income			2,264	(364)
Balance at end of period	$ 304,627	$ 302,363	$ 304,627	$ 105,807