Debt Short-term and Long-term Debt (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Senior Notes	$ 210,000	$ 210,000
Convertible Debt	57,500	57,500
Line of Credit Facility, Amount Outstanding	22,850	0
Other Long-term Debt	798	998
Long-term Debt, Gross	291,148	268,498
Long-term Debt, Unclassified [Abstract]
Less: unamortized discount	(20,278)	(22,502)
Less: current portion	(397)	(397)
Total long-term portion	270,473	245,599
TOTAL SHORT-TERM AND LONG-TERM DEBT	$ 270,870	$ 245,996