Cash Dividends	12 Months Ended
Dec. 31, 2015
Stockholders' Equity Note [Abstract]
Cash Dividends	Cash Dividends On January 26, 2016, our board of directors declared a quarterly dividend to be paid to our stockholders in the first quarter of 2016 of $0.05 per share of common stock, payable on March 11, 2016 to stockholders of record on March 4, 2016, the record date for the dividend payment. On January 27, 2015, our board of directors declared a regular quarterly dividend of $0.15 per share of common stock, which were paid on March 12, June 12, September 11 and December 11 of 2015 to stockholders of record on March 5, June 5, September 4 and December 4 of 2015, the record dates for each of the dividend payments, respectively. We paid $98.3 million in dividends in 2015. On January 29, 2014, our board of directors declared a regular quarterly dividend of $0.15 per share of common stock, which were paid on March 12, June 12, September 12 and December 12 of 2014 to stockholders of record on March 5, June 5, September 5 and December 5 of 2014, the record dates for each of the dividend payments, respectively. We paid $96.6 million in dividends in 2014. On January 23, 2013, our board of directors declared a regular quarterly dividend of $0.15 per share of common stock, which were paid on March 12, June 12, September 12 and December 12 of 2013 to stockholders of record on March 5, June 5, September 5 and December 5 of 2013, the record dates for each of the dividend payments, respectively. We paid $84.0 million in dividends in 2013.

Cash Dividends

12 Months Ended

Dec. 31, 2015

Stockholders' Equity Note [Abstract]

On January 26, 2016, our board of directors declared a quarterly dividend to be paid to our stockholders in the first quarter of 2016 of $0.05 per share of common stock, payable on March 11, 2016 to stockholders of record on March 4, 2016, the record date for the dividend payment.

On January 27, 2015, our board of directors declared a regular quarterly dividend of $0.15 per share of common stock, which were paid on March 12, June 12, September 11 and December 11 of 2015 to stockholders of record on March 5, June 5, September 4 and December 4 of 2015, the record dates for each of the dividend payments, respectively. We paid $98.3 million in dividends in 2015.

On January 29, 2014, our board of directors declared a regular quarterly dividend of $0.15 per share of common stock, which were paid on March 12, June 12, September 12 and December 12 of 2014 to stockholders of record on March 5, June 5, September 5 and December 5 of 2014, the record dates for each of the dividend payments, respectively. We paid $96.6 million in dividends in 2014.

On January 23, 2013, our board of directors declared a regular quarterly dividend of $0.15 per share of common stock, which were paid on March 12, June 12, September 12 and December 12 of 2013 to stockholders of record on March 5, June 5, September 5 and December 5 of 2013, the record dates for each of the dividend payments, respectively. We paid $84.0 million in dividends in 2013.