Acquisitions (Amount of revenues and loss before income taxes - Renin) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Revenues	$ 27,273	$ 21,906	$ 22,650	$ 20,816	$ 30,017	$ 5,658	$ 6,148	$ 6,835	$ 92,645	$ 48,658	$ 33,285
Earnings (Loss)	(2,056)	(1,898)	7,291	1,358	49,525	7,695	(2,849)	(6,532)	4,695	47,839	235,762
Renin Corp [Member]
Business Acquisition [Line Items]
Revenues										9,300
Earnings (Loss)										900
Renin Corp [Member] | Pro Forma [Member]
Business Acquisition [Line Items]
Revenues										104,987	107,303
Earnings (Loss)										$ 43,639	$ (28,794)