Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 15,417	$ 17,344
Other comprehensive income (loss):
Total other comprehensive income (loss)	1,128	(518)
Comprehensive income	$ 16,545	$ 16,826