Notes Payable (Tables)

3 Months Ended

Mar. 31, 2014

Debt Disclosure [Abstract]

Liability and Equity Components of Convertible Senior Notes

The 5.25% Contingent Convertible Senior Notes due December 15, 2029 (the "2029 notes") are accounted for separately as a liability component and an equity component in the consolidated balance sheets. The carrying amount of the 2015 notes and the 2029 notes, the carrying amount of the equity component of the 2029 notes and the amount by which the if-converted value exceeds the outstanding principal for both the 2015 notes and the 2029 notes are as follows:

	March 31, 2014						December 31, 2013
	September 2015 Notes			December 2029 Notes			September 2015 Notes			December 2029 Notes
	(Dollars in thousands)
Notes payable:
Principal amount of liability component	$	91,951		$	37,032		$	91,951		$	68,373
Unamortized discount	(5,712		)	(1,513		)	(6,623		)	(3,743		)
Net carrying amount of liability component	$	86,239		$	35,519		$	85,328		$	64,630
Additional paid-in capital:
Carrying amount of equity component				$	4,983					$	15,586
Amount by which the if-converted value exceeds principal	$	83,860		$	56,960		$	104,403		$	113,169