Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands |
Sep. 30, 2016 |
Dec. 31, 2015 |
| Statement of Financial Position [Abstract] |
|
|
| Allowances |
$ 50,412
|
$ 49,364
|
| Accumulated depreciation |
$ 104,213
|
$ 97,650
|
| Series A preferred shares, par value (in dollars per share) |
$ 0.001
|
$ 0.001
|
| Series A preferred shares authorized (shares) |
1,000,000
|
1,000,000
|
| Series A preferred shares issued (shares) |
200,000
|
200,000
|
| Series A preferred shares outstanding (shares) |
200,000
|
200,000
|
| Series A preferred shares, redemption amount |
$ 203,000
|
$ 203,000
|
| Series A preferred shares, liquidation preference |
$ 203,000
|
$ 203,000
|
| Preferred shares, par value (in dollars per share) |
$ 0.001
|
$ 0.001
|
| Preferred shares authorized (shares) |
4,000,000
|
4,000,000
|
| Preferred shares outstanding (shares) |
0
|
0
|
| Common shares, par value (in dollars per share) |
$ 0.001
|
$ 0.001
|
| Common shares authorized (shares) |
250,000,000
|
250,000,000
|
| Common shares issued (shares) |
93,814,222
|
93,101,007
|
| Common shares outstanding (shares) |
73,535,800
|
72,851,418
|
| Treasury stock (shares) |
20,278,422
|
20,249,589
|